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- Multi-Port Serial Interface: Provides four independent asynchronous serial ports, allowing simultaneous communication with multiple RS422 or RS485 devices.
- Communication Standards: Fully compliant with RS422 and RS485 differential signaling standards, enabling long-distance, noise-resistant data transmission.
- Data Rate Range: Supports baud rates from 50 bps up to 57,600 bps, suitable for a wide range of industrial and instrumentation applications.
- UART Controller: Each port is equipped with a 16450 UART (Universal Asynchronous Receiver/Transmitter), ensuring reliable buffering and data handling for asynchronous serial communication.
- ISA Bus Interface: Designed for standard ISA bus architecture, compatible with legacy and industrial PC systems requiring ISA expansion slots.
- Interrupt Configuration: Supports IRQ lines 2 through 7, allowing flexible interrupt assignment to avoid conflicts with other system devices.
- Adapter Cable Included: Comes with a DB-62 to 4×DB25 adapter cable, providing convenient access to four standard DB25 serial connectors.
- Compact Industrial Design: PCB dimensions of 215 mm × 100 mm, optimized for installation in standard ISA slots within industrial PCs or control systems.
- Asynchronous Operation: Each port operates independently, supporting full-duplex communication and asynchronous data exchange.
- Robust Electrical Design: RS422/485 differential signaling ensures high noise immunity and reliable communication over extended cable lengths.
- Communication Standards: Fully compliant with RS422 and RS485 differential signaling standards, enabling long-distance, noise-resistant data transmission.
- Data Rate Range: Supports baud rates from 50 bps up to 57,600 bps, suitable for a wide range of industrial and instrumentation applications.
- UART Controller: Each port is equipped with a 16450 UART (Universal Asynchronous Receiver/Transmitter), ensuring reliable buffering and data handling for asynchronous serial communication.
- ISA Bus Interface: Designed for standard ISA bus architecture, compatible with legacy and industrial PC systems requiring ISA expansion slots.
- Interrupt Configuration: Supports IRQ lines 2 through 7, allowing flexible interrupt assignment to avoid conflicts with other system devices.
- Adapter Cable Included: Comes with a DB-62 to 4×DB25 adapter cable, providing convenient access to four standard DB25 serial connectors.
- Compact Industrial Design: PCB dimensions of 215 mm × 100 mm, optimized for installation in standard ISA slots within industrial PCs or control systems.
- Asynchronous Operation: Each port operates independently, supporting full-duplex communication and asynchronous data exchange.
- Robust Electrical Design: RS422/485 differential signaling ensures high noise immunity and reliable communication over extended cable lengths.
1. Product Overview
Product Name: SL-03
Model: SL-03
Series: Industrial Communication Interface Series – RS422/RS485 Multi-Port Serial Adapters
Article Number: SL-03
Manufacturer: [Manufacturer not specified in source content; typically produced by an industrial communication hardware vendor specializing in ISA bus serial interface cards]
The SL-03 is a high-performance, industrial-grade ISA bus serial communication card designed to provide four asynchronous serial ports supporting RS422 and RS485 communication standards. It is engineered for reliable data transmission in industrial automation, process control, and embedded system environments where robust multi-port serial connectivity is required. The card supports data rates from 50 to 57,600 bits per second (bps) and integrates a 16450 UART controller for each port, ensuring stable and efficient asynchronous communication.
2. Key Features
- Multi-Port Serial Interface: Provides four independent asynchronous serial ports, allowing simultaneous communication with multiple RS422 or RS485 devices.
- Communication Standards: Fully compliant with RS422 and RS485 differential signaling standards, enabling long-distance, noise-resistant data transmission.
- Data Rate Range: Supports baud rates from 50 bps up to 57,600 bps, suitable for a wide range of industrial and instrumentation applications.
- UART Controller: Each port is equipped with a 16450 UART (Universal Asynchronous Receiver/Transmitter), ensuring reliable buffering and data handling for asynchronous serial communication.
- ISA Bus Interface: Designed for standard ISA bus architecture, compatible with legacy and industrial PC systems requiring ISA expansion slots.
- Interrupt Configuration: Supports IRQ lines 2 through 7, allowing flexible interrupt assignment to avoid conflicts with other system devices.
- Adapter Cable Included: Comes with a DB-62 to 4×DB25 adapter cable, providing convenient access to four standard DB25 serial connectors.
- Compact Industrial Design: PCB dimensions of 215 mm × 100 mm, optimized for installation in standard ISA slots within industrial PCs or control systems.
- Asynchronous Operation: Each port operates independently, supporting full-duplex communication and asynchronous data exchange.
- Robust Electrical Design: RS422/485 differential signaling ensures high noise immunity and reliable communication over extended cable lengths.
3. Technical Specifications
- Bus Interface: ISA (Industry Standard Architecture)
- Communication Standards: RS422 and RS485 (differential signaling)
- Number of Ports: 4 asynchronous serial ports
- UART Type: 16450 UART per port
- Baud Rate Range: 50 bps to 57,600 bps
- Interrupt Lines (IRQ): Selectable from IRQ 2, 3, 4, 5, 6, or 7
- Connector Type: DB-62 (on card) to 4×DB25 (via included adapter cable)
- Cable Assembly: DB-62 male to four DB25 female connectors
- Physical Dimensions: 215 mm (length) × 100 mm (height)
- Weight: [Not specified; estimated ~150–200 g depending on PCB and connector assembly]
- Power Requirements: [Not specified; typical ISA slot power consumption for multi-port serial cards is minimal, generally <5 W]
- Operating Temperature: [Not specified; typically 0°C to 50°C for standard industrial cards]
- Storage Temperature: [Not specified; typically -20°C to 70°C]
- Material: Multi-layer PCB with gold-plated edge connector, industrial-grade components for durability and signal integrity.
4. Functionality
The SL-03 functions as a four-port asynchronous serial communication interface card for ISA-based computer systems. Each port can be configured for RS422 or RS485 operation, depending on the connected devices and system requirements.
How It Works:
- The card is installed into an ISA expansion slot on the host PC motherboard.
- Each of the four ports is managed by an independent 16450 UART, which handles serial data buffering, transmission, and reception.
- The UARTs communicate with the host CPU via the ISA bus, allowing software applications or drivers to send and receive serial data.
- RS422/485 differential signaling ensures that data integrity is maintained even in electrically noisy environments or over long cable runs.
- The included DB-62 to 4×DB25 adapter cable provides standard serial connectors for external devices such as PLCs, sensors, controllers, or other RS422/485-enabled equipment.
Use Cases and Applications:
- Industrial automation systems requiring multiple serial communication channels.
- Process control and monitoring systems interfacing with RS422/485 field devices.
- Data acquisition systems connecting to sensors, transducers, or measurement instruments.
- Embedded control systems and legacy industrial PCs with ISA expansion capability.
- Communication gateways, protocol converters, and serial device servers.
- Laboratory instrumentation and test setups requiring multiple asynchronous serial links.
Compatibility:
- Compatible with ISA-based industrial PCs and embedded controllers.
- Supports standard serial communication protocols over RS422/485.
- Works with operating systems and software that support standard COM port interfaces (e.g., DOS, early Windows, or custom embedded OS environments).
5. Components & Accessories
Included Items:
- SL-03 ISA RS422/485 4-Port Serial Card
- Adapter Cable: DB-62 male connector (card side) to four DB25 female connectors (device side)
- Documentation: Basic installation and configuration guide (if provided by manufacturer)
Optional Add-ons (not included but commonly used):
- RS422/485 terminal blocks or breakout boxes for easier wiring.
- Shielded twisted-pair cables for long-distance communication.
- External power isolators or surge protectors for harsh industrial environments.
- Mounting brackets or retention clips for secure installation in vibration-prone systems.
Connectors:
- On-board: One DB-62 connector (female or male depending on card design)
- Adapter Cable: Four DB25 connectors providing standard pinouts for RS422/485 communication lines (TX+, TX−, RX+, RX−, GND, etc.)
6. Installation & Setup
Requirements:
- Host system with available ISA expansion slot.
- Compatible operating system or driver capable of recognizing additional COM ports.
- Proper configuration of IRQ and I/O address settings to avoid conflicts with other devices.
Installation Steps:
1. Power off the host system and disconnect it from the power source.
2. Insert the SL-03 card into an available ISA slot, ensuring proper alignment and secure seating.
3. Attach the DB-62 to 4×DB25 adapter cable to the card’s external connector.
4. Connect external RS422/485 devices to the DB25 connectors using appropriate cables.
5. Configure the card’s IRQ and I/O address settings via jumpers or DIP switches (depending on card revision).
6. Power on the system and verify that the new serial ports are recognized by the operating system or communication software.
7. Test communication with connected devices to confirm proper operation.
Mounting Options:
- Standard ISA slot mounting within PC chassis.
- Can be used in rack-mounted or industrial enclosures supporting ISA backplanes.
Configuration:
- Hardware configuration via jumpers for IRQ selection and possibly RS422/485 mode selection.
- Software configuration through serial communication software or driver settings to define baud rate, parity, stop bits, and data bits.
7. Performance & Capabilities
Speed and Throughput:
- Supports baud rates from 50 bps to 57,600 bps, covering low-speed instrumentation to moderate-speed industrial communication requirements.
- Each port operates independently, allowing simultaneous multi-channel communication without interference.
Capacity:
- Four fully functional asynchronous serial channels.
- Each channel can handle full-duplex communication (RS422) or half-duplex (RS485) depending on configuration.
Efficiency:
- 16450 UARTs provide efficient data buffering and interrupt-driven communication, minimizing CPU load.
- Differential signaling ensures high data integrity and low error rates even over long cable distances (up to 1200 meters typical for RS485).
Limitations:
- Maximum baud rate limited to 57,600 bps (not suitable for high-speed serial applications requiring 115,200 bps or higher).
- ISA bus interface restricts use to legacy or industrial systems with ISA slots.
- No onboard isolation or surge protection (external protection recommended for harsh environments).
8. Standards & Compliance
Electrical Standards:
- RS422 (EIA-422) and RS485 (EIA-485) compliant differential signaling.
- Compatible with standard asynchronous serial communication protocols.
Bus Interface Standard:
- ISA (Industry Standard Architecture) 8/16-bit bus compatibility.
Regulatory Compliance:
- [Not specified; typical compliance includes CE and FCC Class A for industrial equipment, depending on manufacturer.]
- Designed for industrial and laboratory use, adhering to general EMC and safety guidelines for serial communication hardware.
Industry Standards Supported:
- EIA/TIA-422 and EIA/TIA-485 electrical interface standards.
- UART communication standard (16450 type).
- Standard COM port addressing conventions for PC-based systems.
9. Additional Information
Warranty:
- [Not specified; typical industrial hardware warranty ranges from 1 to 3 years depending on manufacturer.]
Support:
- Technical support typically includes driver assistance, configuration guidance, and troubleshooting for communication issues.
- Documentation may include pinout diagrams, jumper settings, and example configurations.
Maintenance:
- Minimal maintenance required; periodic inspection of connectors and cables recommended.
- Ensure proper grounding and shielding to maintain signal integrity.
Firmware/Software Updates:
- Not applicable; the SL-03 is a hardware-based ISA card with fixed UART logic (no firmware updates required).
- Software drivers or configuration utilities may be updated depending on operating system compatibility.
Serviceability:
- Field-replaceable; can be easily swapped in case of failure.
- No user-serviceable internal components beyond jumper configuration.
Longevity and Availability:
- Designed for long-term use in industrial environments where ISA-based systems remain in operation.
- Suitable for legacy system maintenance, upgrades, or expansion of existing RS422/485 communication infrastructure.
Summary
The SL-03 ISA RS422/485 4-Port Asynchronous Serial Card is a robust, industrial-grade communication interface designed for systems requiring multiple serial connections over RS422 or RS485 standards. With four independent ports, each managed by a 16450 UART, the SL-03 provides reliable, noise-resistant, and flexible serial communication at data rates from 50 to 57,600 bps. Its ISA bus interface ensures compatibility with legacy industrial PCs and embedded systems, while the included DB-62 to 4×DB25 adapter cable simplifies connectivity to external devices.
Engineered for industrial automation, process control, and data acquisition applications, the SL-03 offers dependable performance, straightforward installation, and long-term operational stability. It remains a practical solution for maintaining and expanding serial communication capabilities in environments where ISA-based systems continue to serve critical roles.
Product Name: SL-03
Model: SL-03
Series: Industrial Communication Interface Series – RS422/RS485 Multi-Port Serial Adapters
Article Number: SL-03
Manufacturer: [Manufacturer not specified in source content; typically produced by an industrial communication hardware vendor specializing in ISA bus serial interface cards]
The SL-03 is a high-performance, industrial-grade ISA bus serial communication card designed to provide four asynchronous serial ports supporting RS422 and RS485 communication standards. It is engineered for reliable data transmission in industrial automation, process control, and embedded system environments where robust multi-port serial connectivity is required. The card supports data rates from 50 to 57,600 bits per second (bps) and integrates a 16450 UART controller for each port, ensuring stable and efficient asynchronous communication.
2. Key Features
- Multi-Port Serial Interface: Provides four independent asynchronous serial ports, allowing simultaneous communication with multiple RS422 or RS485 devices.
- Communication Standards: Fully compliant with RS422 and RS485 differential signaling standards, enabling long-distance, noise-resistant data transmission.
- Data Rate Range: Supports baud rates from 50 bps up to 57,600 bps, suitable for a wide range of industrial and instrumentation applications.
- UART Controller: Each port is equipped with a 16450 UART (Universal Asynchronous Receiver/Transmitter), ensuring reliable buffering and data handling for asynchronous serial communication.
- ISA Bus Interface: Designed for standard ISA bus architecture, compatible with legacy and industrial PC systems requiring ISA expansion slots.
- Interrupt Configuration: Supports IRQ lines 2 through 7, allowing flexible interrupt assignment to avoid conflicts with other system devices.
- Adapter Cable Included: Comes with a DB-62 to 4×DB25 adapter cable, providing convenient access to four standard DB25 serial connectors.
- Compact Industrial Design: PCB dimensions of 215 mm × 100 mm, optimized for installation in standard ISA slots within industrial PCs or control systems.
- Asynchronous Operation: Each port operates independently, supporting full-duplex communication and asynchronous data exchange.
- Robust Electrical Design: RS422/485 differential signaling ensures high noise immunity and reliable communication over extended cable lengths.
3. Technical Specifications
- Bus Interface: ISA (Industry Standard Architecture)
- Communication Standards: RS422 and RS485 (differential signaling)
- Number of Ports: 4 asynchronous serial ports
- UART Type: 16450 UART per port
- Baud Rate Range: 50 bps to 57,600 bps
- Interrupt Lines (IRQ): Selectable from IRQ 2, 3, 4, 5, 6, or 7
- Connector Type: DB-62 (on card) to 4×DB25 (via included adapter cable)
- Cable Assembly: DB-62 male to four DB25 female connectors
- Physical Dimensions: 215 mm (length) × 100 mm (height)
- Weight: [Not specified; estimated ~150–200 g depending on PCB and connector assembly]
- Power Requirements: [Not specified; typical ISA slot power consumption for multi-port serial cards is minimal, generally <5 W]
- Operating Temperature: [Not specified; typically 0°C to 50°C for standard industrial cards]
- Storage Temperature: [Not specified; typically -20°C to 70°C]
- Material: Multi-layer PCB with gold-plated edge connector, industrial-grade components for durability and signal integrity.
4. Functionality
The SL-03 functions as a four-port asynchronous serial communication interface card for ISA-based computer systems. Each port can be configured for RS422 or RS485 operation, depending on the connected devices and system requirements.
How It Works:
- The card is installed into an ISA expansion slot on the host PC motherboard.
- Each of the four ports is managed by an independent 16450 UART, which handles serial data buffering, transmission, and reception.
- The UARTs communicate with the host CPU via the ISA bus, allowing software applications or drivers to send and receive serial data.
- RS422/485 differential signaling ensures that data integrity is maintained even in electrically noisy environments or over long cable runs.
- The included DB-62 to 4×DB25 adapter cable provides standard serial connectors for external devices such as PLCs, sensors, controllers, or other RS422/485-enabled equipment.
Use Cases and Applications:
- Industrial automation systems requiring multiple serial communication channels.
- Process control and monitoring systems interfacing with RS422/485 field devices.
- Data acquisition systems connecting to sensors, transducers, or measurement instruments.
- Embedded control systems and legacy industrial PCs with ISA expansion capability.
- Communication gateways, protocol converters, and serial device servers.
- Laboratory instrumentation and test setups requiring multiple asynchronous serial links.
Compatibility:
- Compatible with ISA-based industrial PCs and embedded controllers.
- Supports standard serial communication protocols over RS422/485.
- Works with operating systems and software that support standard COM port interfaces (e.g., DOS, early Windows, or custom embedded OS environments).
5. Components & Accessories
Included Items:
- SL-03 ISA RS422/485 4-Port Serial Card
- Adapter Cable: DB-62 male connector (card side) to four DB25 female connectors (device side)
- Documentation: Basic installation and configuration guide (if provided by manufacturer)
Optional Add-ons (not included but commonly used):
- RS422/485 terminal blocks or breakout boxes for easier wiring.
- Shielded twisted-pair cables for long-distance communication.
- External power isolators or surge protectors for harsh industrial environments.
- Mounting brackets or retention clips for secure installation in vibration-prone systems.
Connectors:
- On-board: One DB-62 connector (female or male depending on card design)
- Adapter Cable: Four DB25 connectors providing standard pinouts for RS422/485 communication lines (TX+, TX−, RX+, RX−, GND, etc.)
6. Installation & Setup
Requirements:
- Host system with available ISA expansion slot.
- Compatible operating system or driver capable of recognizing additional COM ports.
- Proper configuration of IRQ and I/O address settings to avoid conflicts with other devices.
Installation Steps:
1. Power off the host system and disconnect it from the power source.
2. Insert the SL-03 card into an available ISA slot, ensuring proper alignment and secure seating.
3. Attach the DB-62 to 4×DB25 adapter cable to the card’s external connector.
4. Connect external RS422/485 devices to the DB25 connectors using appropriate cables.
5. Configure the card’s IRQ and I/O address settings via jumpers or DIP switches (depending on card revision).
6. Power on the system and verify that the new serial ports are recognized by the operating system or communication software.
7. Test communication with connected devices to confirm proper operation.
Mounting Options:
- Standard ISA slot mounting within PC chassis.
- Can be used in rack-mounted or industrial enclosures supporting ISA backplanes.
Configuration:
- Hardware configuration via jumpers for IRQ selection and possibly RS422/485 mode selection.
- Software configuration through serial communication software or driver settings to define baud rate, parity, stop bits, and data bits.
7. Performance & Capabilities
Speed and Throughput:
- Supports baud rates from 50 bps to 57,600 bps, covering low-speed instrumentation to moderate-speed industrial communication requirements.
- Each port operates independently, allowing simultaneous multi-channel communication without interference.
Capacity:
- Four fully functional asynchronous serial channels.
- Each channel can handle full-duplex communication (RS422) or half-duplex (RS485) depending on configuration.
Efficiency:
- 16450 UARTs provide efficient data buffering and interrupt-driven communication, minimizing CPU load.
- Differential signaling ensures high data integrity and low error rates even over long cable distances (up to 1200 meters typical for RS485).
Limitations:
- Maximum baud rate limited to 57,600 bps (not suitable for high-speed serial applications requiring 115,200 bps or higher).
- ISA bus interface restricts use to legacy or industrial systems with ISA slots.
- No onboard isolation or surge protection (external protection recommended for harsh environments).
8. Standards & Compliance
Electrical Standards:
- RS422 (EIA-422) and RS485 (EIA-485) compliant differential signaling.
- Compatible with standard asynchronous serial communication protocols.
Bus Interface Standard:
- ISA (Industry Standard Architecture) 8/16-bit bus compatibility.
Regulatory Compliance:
- [Not specified; typical compliance includes CE and FCC Class A for industrial equipment, depending on manufacturer.]
- Designed for industrial and laboratory use, adhering to general EMC and safety guidelines for serial communication hardware.
Industry Standards Supported:
- EIA/TIA-422 and EIA/TIA-485 electrical interface standards.
- UART communication standard (16450 type).
- Standard COM port addressing conventions for PC-based systems.
9. Additional Information
Warranty:
- [Not specified; typical industrial hardware warranty ranges from 1 to 3 years depending on manufacturer.]
Support:
- Technical support typically includes driver assistance, configuration guidance, and troubleshooting for communication issues.
- Documentation may include pinout diagrams, jumper settings, and example configurations.
Maintenance:
- Minimal maintenance required; periodic inspection of connectors and cables recommended.
- Ensure proper grounding and shielding to maintain signal integrity.
Firmware/Software Updates:
- Not applicable; the SL-03 is a hardware-based ISA card with fixed UART logic (no firmware updates required).
- Software drivers or configuration utilities may be updated depending on operating system compatibility.
Serviceability:
- Field-replaceable; can be easily swapped in case of failure.
- No user-serviceable internal components beyond jumper configuration.
Longevity and Availability:
- Designed for long-term use in industrial environments where ISA-based systems remain in operation.
- Suitable for legacy system maintenance, upgrades, or expansion of existing RS422/485 communication infrastructure.
Summary
The SL-03 ISA RS422/485 4-Port Asynchronous Serial Card is a robust, industrial-grade communication interface designed for systems requiring multiple serial connections over RS422 or RS485 standards. With four independent ports, each managed by a 16450 UART, the SL-03 provides reliable, noise-resistant, and flexible serial communication at data rates from 50 to 57,600 bps. Its ISA bus interface ensures compatibility with legacy industrial PCs and embedded systems, while the included DB-62 to 4×DB25 adapter cable simplifies connectivity to external devices.
Engineered for industrial automation, process control, and data acquisition applications, the SL-03 offers dependable performance, straightforward installation, and long-term operational stability. It remains a practical solution for maintaining and expanding serial communication capabilities in environments where ISA-based systems continue to serve critical roles.
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