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- Four Independent RS-232 Ports: Each port operates independently with its own I/O address and IRQ configuration.
- Custom ASIC Design: Reduces component count and board size to half-length ISA form factor.
- Software Configuration: No jumpers or DIP switches; all settings are stored in onboard EEPROM and configured via software utility (Io-irq.exe).
- 16550 UARTs: Each port uses a TI 16550 UART with 16-byte FIFO buffers for efficient data handling.
- 16-bit AT Bus Architecture: Ensures compatibility with ISA and EISA systems and supports multiple IRQs.
- Operating System Support: Drivers provided for Windows NT, Windows 95/98, DOS, and Windows 3.x; compatible with Linux, SCO UNIX/XENIX/OpenServer, QNX, FreeBSD, and OS/2.
- High Compatibility: Fully compatible with other multiport boards using 16450/16550 UARTs.
- Quick Installation Mode: Allows automatic configuration under Windows NT/95/98 without running DOS utilities.
- Comprehensive Software Tools: Includes PComm (Windows) and API-232 (DOS/Windows 3.x) libraries for application development.
- Diagnostic and Monitoring Utilities: Built-in tools for port testing, monitoring, and terminal emulation.
- Compact Half-Size Board: Ideal for space-constrained industrial and commercial PC systems.
- Custom ASIC Design: Reduces component count and board size to half-length ISA form factor.
- Software Configuration: No jumpers or DIP switches; all settings are stored in onboard EEPROM and configured via software utility (Io-irq.exe).
- 16550 UARTs: Each port uses a TI 16550 UART with 16-byte FIFO buffers for efficient data handling.
- 16-bit AT Bus Architecture: Ensures compatibility with ISA and EISA systems and supports multiple IRQs.
- Operating System Support: Drivers provided for Windows NT, Windows 95/98, DOS, and Windows 3.x; compatible with Linux, SCO UNIX/XENIX/OpenServer, QNX, FreeBSD, and OS/2.
- High Compatibility: Fully compatible with other multiport boards using 16450/16550 UARTs.
- Quick Installation Mode: Allows automatic configuration under Windows NT/95/98 without running DOS utilities.
- Comprehensive Software Tools: Includes PComm (Windows) and API-232 (DOS/Windows 3.x) libraries for application development.
- Diagnostic and Monitoring Utilities: Built-in tools for port testing, monitoring, and terminal emulation.
- Compact Half-Size Board: Ideal for space-constrained industrial and commercial PC systems.
Comprehensive Product Summary – MOXA Smartio C104P 4-Port RS-232 AT Card (16550 UART)
### 1. Product Overview
Product Name: Smartio C104P
Model: C104P
Series: Smartio C104 Series
Article Number: C104P
Manufacturer: Moxa Technologies Co., Ltd.
Manufacturer Contact:
- Tel: +886-2-8665-6373
- Fax: +886-2-8665-6372
- Website: [www.moxa.com](http://www.moxa.com)
- Email: support@moxa.com.tw
Product Description:
The Moxa Smartio C104P is a universal 4-port asynchronous serial communication board designed for PC/AT and compatible systems. It provides four independent RS-232 serial ports using TI 16550 UARTs, enabling reliable and flexible connectivity for terminals, modems, printers, and industrial devices. The board features a custom ASIC design, software-based configuration (no jumpers or switches), and an onboard EEPROM for storing configuration data. It is supplied with a DB37-to-4×DB9M adapter cable (DB25M optional) and includes Moxa’s API-232 and PComm communication libraries for software development.
### 2. Key Features
- Four Independent RS-232 Ports: Each port operates independently with its own I/O address and IRQ configuration.
- Custom ASIC Design: Reduces component count and board size to half-length ISA form factor.
- Software Configuration: No jumpers or DIP switches; all settings are stored in onboard EEPROM and configured via software utility (Io-irq.exe).
- 16550 UARTs: Each port uses a TI 16550 UART with 16-byte FIFO buffers for efficient data handling.
- 16-bit AT Bus Architecture: Ensures compatibility with ISA and EISA systems and supports multiple IRQs.
- Operating System Support: Drivers provided for Windows NT, Windows 95/98, DOS, and Windows 3.x; compatible with Linux, SCO UNIX/XENIX/OpenServer, QNX, FreeBSD, and OS/2.
- High Compatibility: Fully compatible with other multiport boards using 16450/16550 UARTs.
- Quick Installation Mode: Allows automatic configuration under Windows NT/95/98 without running DOS utilities.
- Comprehensive Software Tools: Includes PComm (Windows) and API-232 (DOS/Windows 3.x) libraries for application development.
- Diagnostic and Monitoring Utilities: Built-in tools for port testing, monitoring, and terminal emulation.
- Compact Half-Size Board: Ideal for space-constrained industrial and commercial PC systems.
### 3. Technical Specifications
| Parameter | Specification |
|----------------|-------------------|
| Bus Interface | ISA (EISA compatible), 16-bit AT bus |
| Number of Ports | 4 independent RS-232 ports |
| UART Type | 4 × 16550 or compatible |
| I/O Address Range | 0x0000 – 0xFFFF |
| Default I/O Addresses | Port 1: 0x180, Port 2: 0x188, Port 3: 0x190, Port 4: 0x198 |
| IRQ Options | 2, 3, 4, 5, 7, 10, 11, 12, 15 |
| Default IRQ | 10 |
| Interrupt Vector | 0x1C0 (default) |
| Data Bits | 5, 6, 7, 8 |
| Stop Bits | 1, 1.5, 2 |
| Parity | None, Even, Odd, Space, Mark |
| Baud Rate | 50 bps to 115.2 Kbps |
| Connectors | DB37 (on board) to 4 × DB9M (Opt4D) or 4 × DB25M (Opt4C) |
| Signal Lines | RS-232: TxD, RxD, RTS, CTS, DTR, DSR, DCD, GND |
| Surge Protection | Up to 2000 V (C104HS model) |
| Operating Temperature | 0°C to 55°C |
| Power Requirements | +5V @ 90 mA max, +12V @ 55 mA max, -12V @ 75 mA max |
| Dimensions | 157 mm × 83 mm (half-size ISA card) |
| Weight | Approx. 150 g (board only) |
| Operating Systems | Windows NT/95/98, DOS, Windows 3.x, Linux, SCO UNIX/XENIX/OpenServer, QNX, FreeBSD, OS/2 |
### 4. Functionality
Operation Principle:
The C104P provides four asynchronous serial communication channels through RS-232 interfaces. Each port is managed by a 16550 UART, offering buffered data transmission and reception. Configuration data (I/O address, IRQ, interrupt vector) is stored in onboard EEPROM and accessed via the Configuration Access Port (CAP). The board communicates with the host system through the ISA bus.
Use Cases and Applications:
- Industrial automation and process control
- Data acquisition systems
- POS (Point-of-Sale) terminals
- Remote access and modem pooling
- Office automation and serial device networking
- Kiosk and vending machine systems
- Telecommunication and SCADA systems
Compatibility:
Fully compatible with standard PC/AT systems and software using Microsoft Win32 COMM API or DOS API-232 interface. Supports integration with third-party applications such as pcANYWHERE, LabView, WinFax Pro, and PROCOMM PLUS.
### 5. Components & Accessories
Included Items:
- C104P 4-port RS-232 AT board
- Driver diskettes:
- Windows NT/95/98 driver disk
- DOS/Windows 3.x driver disk
- PComm Lite diskette (Windows communication library)
- User’s Manual (printed and electronic)
- Adapter cable (0.3 m) DB37 to 4 × DB9M (Opt4D) or DB25M (Opt4C)
Optional Accessories:
- Opt4C: DB37 to 4 × DB25 male connectors
- Opt4D: DB37 to 4 × DB9 male connectors
- Additional serial cables (null modem or straight-through)
Connectors:
- On-board DB37 female connector
- Adapter cable to four DB9M or DB25M connectors
- Pinouts provided for all signal lines (TxD, RxD, RTS, CTS, DTR, DSR, DCD, GND)
### 6. Installation & Setup
Hardware Installation:
1. Power off the PC and insert the C104P into a free 16-bit ISA slot.
2. For quick installation (Windows NT/95/98, single board), short jumper JP1 to fix CAP address at 0xA700.
3. For multiple boards or other OS, leave JP1 open and configure using Io-irq.exe under DOS.
4. Verify no I/O or IRQ conflicts with other devices.
5. Connect the DB37 adapter cable to the board and attach serial devices.
Software Installation:
- Windows NT: Install via Control Panel → Network → Adapters → Have Disk → select “MOXA Smartio/Industio Family.” Configure I/O, IRQ, and COM mappings.
- Windows 95/98: Run Setup95.exe, configure board and ports in the Moxa Configuration Panel, and restart the system.
- DOS/Windows 3.x: Run DOSINST.EXE or WININST.EXE to install API-232 drivers. Configure ports using SETUP.EXE or Configuration utility.
- Linux/UNIX: Use standard serial drivers or request Moxa-supported drivers.
Configuration Utility (Io-irq.exe):
- Used under DOS to set I/O address, IRQ, and interrupt vector.
- CAP address equals Port 1 base I/O address (default 0x180) or 0xA700 when JP1 is shorted.
- Configuration stored in EEPROM.
### 7. Performance & Capabilities
- Transmission Speed: 50 bps to 115.2 Kbps (normal speed mode).
- FIFO Buffers: 16-byte transmit and receive FIFOs per port.
- Interrupt Handling: Supports both interrupt vector and polling modes; interrupt vector mode provides higher performance.
- Port Independence: Each port can be assigned unique I/O address and IRQ.
- Maximum Boards per System: Up to four C104P boards (16 ports total).
- Driver Support:
- Windows NT: up to 256 COM ports (COM1–COM256)
- Windows 95/98: up to 128 COM ports (COM1–COM128)
- Windows 3.x: up to 9 COM ports (COM1–COM9)
- Limitations:
- Not designed for high-speed (above 115.2 Kbps) operation.
- Requires cold restart after configuration changes.
- ISA bus only (no PCI support).
### 8. Standards & Compliance
- Electrical Interface: RS-232 (EIA/TIA-232 standard)
- Bus Interface: ISA/EISA 16-bit AT bus
- UART Compatibility: 16550 standard
- Operating System Compliance:
- Windows NT/95/98 (Win32 COMM API)
- DOS/Windows 3.x (API-232)
- Linux, UNIX, QNX, FreeBSD, OS/2 (standard serial driver support)
- Regulatory Compliance:
- Designed to meet PC/AT hardware standards
- Surge protection up to 2000 V (C104HS variant)
- Industry Standards:
- RS-232 signal levels and pin assignments
- Microsoft Win32 and Win16 COMM API compatibility
### 9. Additional Information
Warranty & Support:
Moxa provides standard warranty coverage for manufacturing defects. Technical support is available via email (support@moxa.com.tw), FTP (ftp.moxa.com), and the official website. Updated drivers, manuals, and utilities can be downloaded from Moxa’s FTP or web portal.
Maintenance:
- Periodically check cable connections and ensure proper grounding.
- Use Moxa diagnostic utilities to verify port functionality.
- Avoid IRQ and I/O conflicts when adding new hardware.
Software Tools & Utilities:
- PComm (Windows NT/95/98):
- Serial communication library for Visual C++, Visual Basic, Delphi.
- Utilities: Diagnostic, Monitor, Terminal Emulator (VT100/ANSI).
- API-232 (DOS/Windows 3.x):
- Library for C, Pascal, Assembly, BASIC, Clipper.
- Includes modem control and file transfer functions (ASCII, XMODEM, YMODEM, ZMODEM, KERMIT).
- Utilities: Data Scope, Diagnose, TTY terminal emulator.
Troubleshooting Highlights:
- Board Not Detected: Check slot seating, I/O conflicts, or CAP address.
- No Data Transfer: Verify cable wiring and flow control settings.
- IRQ Conflicts: Adjust IRQ assignments via Io-irq.exe or OS configuration panel.
- CAP Address Unknown: Short JP1 to force CAP = 0xA700, reconfigure, then remove jumper.
Return & RMA Procedure:
For repair or replacement, fill out the Problem Report Form (PRF) with serial number, driver version, and configuration details. Obtain an RMA number before returning the product in anti-static packaging.
### Summary
The Moxa Smartio C104P is a robust, software-configurable 4-port RS-232 serial communication board for ISA-based PC systems. It combines flexibility, reliability, and ease of integration through its jumperless design, EEPROM-based configuration, and comprehensive driver support. With compatibility across multiple operating systems and development environments, the C104P is ideal for industrial automation, data acquisition, and multi-user communication applications requiring stable and configurable serial connectivity.
Its combination of hardware efficiency (custom ASIC, 16550 UARTs), software tools (PComm, API-232), and broad OS support makes it a long-standing solution for legacy and embedded serial communication systems.
### 1. Product Overview
Product Name: Smartio C104P
Model: C104P
Series: Smartio C104 Series
Article Number: C104P
Manufacturer: Moxa Technologies Co., Ltd.
Manufacturer Contact:
- Tel: +886-2-8665-6373
- Fax: +886-2-8665-6372
- Website: [www.moxa.com](http://www.moxa.com)
- Email: support@moxa.com.tw
Product Description:
The Moxa Smartio C104P is a universal 4-port asynchronous serial communication board designed for PC/AT and compatible systems. It provides four independent RS-232 serial ports using TI 16550 UARTs, enabling reliable and flexible connectivity for terminals, modems, printers, and industrial devices. The board features a custom ASIC design, software-based configuration (no jumpers or switches), and an onboard EEPROM for storing configuration data. It is supplied with a DB37-to-4×DB9M adapter cable (DB25M optional) and includes Moxa’s API-232 and PComm communication libraries for software development.
### 2. Key Features
- Four Independent RS-232 Ports: Each port operates independently with its own I/O address and IRQ configuration.
- Custom ASIC Design: Reduces component count and board size to half-length ISA form factor.
- Software Configuration: No jumpers or DIP switches; all settings are stored in onboard EEPROM and configured via software utility (Io-irq.exe).
- 16550 UARTs: Each port uses a TI 16550 UART with 16-byte FIFO buffers for efficient data handling.
- 16-bit AT Bus Architecture: Ensures compatibility with ISA and EISA systems and supports multiple IRQs.
- Operating System Support: Drivers provided for Windows NT, Windows 95/98, DOS, and Windows 3.x; compatible with Linux, SCO UNIX/XENIX/OpenServer, QNX, FreeBSD, and OS/2.
- High Compatibility: Fully compatible with other multiport boards using 16450/16550 UARTs.
- Quick Installation Mode: Allows automatic configuration under Windows NT/95/98 without running DOS utilities.
- Comprehensive Software Tools: Includes PComm (Windows) and API-232 (DOS/Windows 3.x) libraries for application development.
- Diagnostic and Monitoring Utilities: Built-in tools for port testing, monitoring, and terminal emulation.
- Compact Half-Size Board: Ideal for space-constrained industrial and commercial PC systems.
### 3. Technical Specifications
| Parameter | Specification |
|----------------|-------------------|
| Bus Interface | ISA (EISA compatible), 16-bit AT bus |
| Number of Ports | 4 independent RS-232 ports |
| UART Type | 4 × 16550 or compatible |
| I/O Address Range | 0x0000 – 0xFFFF |
| Default I/O Addresses | Port 1: 0x180, Port 2: 0x188, Port 3: 0x190, Port 4: 0x198 |
| IRQ Options | 2, 3, 4, 5, 7, 10, 11, 12, 15 |
| Default IRQ | 10 |
| Interrupt Vector | 0x1C0 (default) |
| Data Bits | 5, 6, 7, 8 |
| Stop Bits | 1, 1.5, 2 |
| Parity | None, Even, Odd, Space, Mark |
| Baud Rate | 50 bps to 115.2 Kbps |
| Connectors | DB37 (on board) to 4 × DB9M (Opt4D) or 4 × DB25M (Opt4C) |
| Signal Lines | RS-232: TxD, RxD, RTS, CTS, DTR, DSR, DCD, GND |
| Surge Protection | Up to 2000 V (C104HS model) |
| Operating Temperature | 0°C to 55°C |
| Power Requirements | +5V @ 90 mA max, +12V @ 55 mA max, -12V @ 75 mA max |
| Dimensions | 157 mm × 83 mm (half-size ISA card) |
| Weight | Approx. 150 g (board only) |
| Operating Systems | Windows NT/95/98, DOS, Windows 3.x, Linux, SCO UNIX/XENIX/OpenServer, QNX, FreeBSD, OS/2 |
### 4. Functionality
Operation Principle:
The C104P provides four asynchronous serial communication channels through RS-232 interfaces. Each port is managed by a 16550 UART, offering buffered data transmission and reception. Configuration data (I/O address, IRQ, interrupt vector) is stored in onboard EEPROM and accessed via the Configuration Access Port (CAP). The board communicates with the host system through the ISA bus.
Use Cases and Applications:
- Industrial automation and process control
- Data acquisition systems
- POS (Point-of-Sale) terminals
- Remote access and modem pooling
- Office automation and serial device networking
- Kiosk and vending machine systems
- Telecommunication and SCADA systems
Compatibility:
Fully compatible with standard PC/AT systems and software using Microsoft Win32 COMM API or DOS API-232 interface. Supports integration with third-party applications such as pcANYWHERE, LabView, WinFax Pro, and PROCOMM PLUS.
### 5. Components & Accessories
Included Items:
- C104P 4-port RS-232 AT board
- Driver diskettes:
- Windows NT/95/98 driver disk
- DOS/Windows 3.x driver disk
- PComm Lite diskette (Windows communication library)
- User’s Manual (printed and electronic)
- Adapter cable (0.3 m) DB37 to 4 × DB9M (Opt4D) or DB25M (Opt4C)
Optional Accessories:
- Opt4C: DB37 to 4 × DB25 male connectors
- Opt4D: DB37 to 4 × DB9 male connectors
- Additional serial cables (null modem or straight-through)
Connectors:
- On-board DB37 female connector
- Adapter cable to four DB9M or DB25M connectors
- Pinouts provided for all signal lines (TxD, RxD, RTS, CTS, DTR, DSR, DCD, GND)
### 6. Installation & Setup
Hardware Installation:
1. Power off the PC and insert the C104P into a free 16-bit ISA slot.
2. For quick installation (Windows NT/95/98, single board), short jumper JP1 to fix CAP address at 0xA700.
3. For multiple boards or other OS, leave JP1 open and configure using Io-irq.exe under DOS.
4. Verify no I/O or IRQ conflicts with other devices.
5. Connect the DB37 adapter cable to the board and attach serial devices.
Software Installation:
- Windows NT: Install via Control Panel → Network → Adapters → Have Disk → select “MOXA Smartio/Industio Family.” Configure I/O, IRQ, and COM mappings.
- Windows 95/98: Run Setup95.exe, configure board and ports in the Moxa Configuration Panel, and restart the system.
- DOS/Windows 3.x: Run DOSINST.EXE or WININST.EXE to install API-232 drivers. Configure ports using SETUP.EXE or Configuration utility.
- Linux/UNIX: Use standard serial drivers or request Moxa-supported drivers.
Configuration Utility (Io-irq.exe):
- Used under DOS to set I/O address, IRQ, and interrupt vector.
- CAP address equals Port 1 base I/O address (default 0x180) or 0xA700 when JP1 is shorted.
- Configuration stored in EEPROM.
### 7. Performance & Capabilities
- Transmission Speed: 50 bps to 115.2 Kbps (normal speed mode).
- FIFO Buffers: 16-byte transmit and receive FIFOs per port.
- Interrupt Handling: Supports both interrupt vector and polling modes; interrupt vector mode provides higher performance.
- Port Independence: Each port can be assigned unique I/O address and IRQ.
- Maximum Boards per System: Up to four C104P boards (16 ports total).
- Driver Support:
- Windows NT: up to 256 COM ports (COM1–COM256)
- Windows 95/98: up to 128 COM ports (COM1–COM128)
- Windows 3.x: up to 9 COM ports (COM1–COM9)
- Limitations:
- Not designed for high-speed (above 115.2 Kbps) operation.
- Requires cold restart after configuration changes.
- ISA bus only (no PCI support).
### 8. Standards & Compliance
- Electrical Interface: RS-232 (EIA/TIA-232 standard)
- Bus Interface: ISA/EISA 16-bit AT bus
- UART Compatibility: 16550 standard
- Operating System Compliance:
- Windows NT/95/98 (Win32 COMM API)
- DOS/Windows 3.x (API-232)
- Linux, UNIX, QNX, FreeBSD, OS/2 (standard serial driver support)
- Regulatory Compliance:
- Designed to meet PC/AT hardware standards
- Surge protection up to 2000 V (C104HS variant)
- Industry Standards:
- RS-232 signal levels and pin assignments
- Microsoft Win32 and Win16 COMM API compatibility
### 9. Additional Information
Warranty & Support:
Moxa provides standard warranty coverage for manufacturing defects. Technical support is available via email (support@moxa.com.tw), FTP (ftp.moxa.com), and the official website. Updated drivers, manuals, and utilities can be downloaded from Moxa’s FTP or web portal.
Maintenance:
- Periodically check cable connections and ensure proper grounding.
- Use Moxa diagnostic utilities to verify port functionality.
- Avoid IRQ and I/O conflicts when adding new hardware.
Software Tools & Utilities:
- PComm (Windows NT/95/98):
- Serial communication library for Visual C++, Visual Basic, Delphi.
- Utilities: Diagnostic, Monitor, Terminal Emulator (VT100/ANSI).
- API-232 (DOS/Windows 3.x):
- Library for C, Pascal, Assembly, BASIC, Clipper.
- Includes modem control and file transfer functions (ASCII, XMODEM, YMODEM, ZMODEM, KERMIT).
- Utilities: Data Scope, Diagnose, TTY terminal emulator.
Troubleshooting Highlights:
- Board Not Detected: Check slot seating, I/O conflicts, or CAP address.
- No Data Transfer: Verify cable wiring and flow control settings.
- IRQ Conflicts: Adjust IRQ assignments via Io-irq.exe or OS configuration panel.
- CAP Address Unknown: Short JP1 to force CAP = 0xA700, reconfigure, then remove jumper.
Return & RMA Procedure:
For repair or replacement, fill out the Problem Report Form (PRF) with serial number, driver version, and configuration details. Obtain an RMA number before returning the product in anti-static packaging.
### Summary
The Moxa Smartio C104P is a robust, software-configurable 4-port RS-232 serial communication board for ISA-based PC systems. It combines flexibility, reliability, and ease of integration through its jumperless design, EEPROM-based configuration, and comprehensive driver support. With compatibility across multiple operating systems and development environments, the C104P is ideal for industrial automation, data acquisition, and multi-user communication applications requiring stable and configurable serial connectivity.
Its combination of hardware efficiency (custom ASIC, 16550 UARTs), software tools (PComm, API-232), and broad OS support makes it a long-standing solution for legacy and embedded serial communication systems.
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C104P.pdf
Manual
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