Comprehensive Product Summary – EX9521D Addressable RS422/485 to RS232 Converter

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### 1. Product Overview

Product Name: EX9521D
Model Number: EX9521D
Series: EX952N Series
Article Number: EX9521D
Manufacturer: Topsccc

The EX9521D is part of the EX952N family of industrial communication converters designed to bridge RS422/RS485 networks with RS232 devices. It integrates a high-performance Intel 80188 CPU running at 40 MHz and operates as an addressable RS485-to-RS232 converter. The device is engineered for industrial automation, data acquisition, and control systems requiring reliable serial communication over extended distances. It features a fanless design, wide operating temperature range, and embedded ROM-DOS operating system for robust, autonomous operation in harsh environments.

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### 2. Key Features

- Addressable RS422/485 to RS232 Converter: Enables multiple RS232 devices to communicate over a shared RS485 network using unique module addresses.
- High-Performance Embedded CPU: Intel 80188 processor at 40 MHz ensures fast command processing and stable communication.
- Integrated Memory Architecture:
- 256 KB SRAM
- 512 KB Flash ROM
- 2 KB EEPROM for configuration storage
- Embedded Operating System: ROM-DOS (Datalight) provides a stable embedded environment for firmware execution and data management.
- Communication Interfaces:
- COM1: RS232 (5-wire)
- COM2: RS485 (2-wire)
- Program Download Support: Firmware updates and configuration can be performed via RS232 using Xmodem protocol.
- Watchdog Timer: Ensures system reliability by automatically recovering from software faults or communication errors.
- Wide Power Input Range: Operates from an unregulated 10–30 VDC supply, suitable for industrial power systems.
- Wide Temperature Operation: -25°C to +75°C operating range, -40°C to +80°C storage range.
- 7-Segment LED Display: Provides visual feedback for baud rate and operational status.
- Fanless, Compact Design: Ideal for embedded and industrial environments with limited space and airflow.
- Built-in Real-Time Clock (RTC): Supports time-stamped data logging and scheduling.
- High-Speed Communication: Supports baud rates up to 115.2 Kbps.
- Addressable Command Protocol: Allows configuration and control via ASCII-based command sets.
- Fault Tolerance: Hardware watchdog and EEPROM-based configuration retention ensure resilience against power loss or system resets.

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### 3. Technical Specifications

| Parameter | Specification |
|----------------|-------------------|
| CPU | Intel 80188, 40 MHz |
| SRAM | 256 KB |
| Flash ROM | 512 KB |
| EEPROM | 2 KB |
| Operating System | Embedded ROM-DOS (Datalight) |
| Communication Ports | COM1: RS232 (5-wire), COM2: RS485 |
| Communication Speed | Up to 115.2 Kbps |
| Power Supply | Unregulated 10–30 VDC |
| Operating Temperature | -25°C to +75°C |
| Storage Temperature | -40°C to +80°C |
| Display | 7-segment LED indicator |
| Watchdog Timer | Hardware-based automatic recovery |
| RTC Support | Yes |
| Cooling | Fanless |
| Mounting | DIN-rail or panel mount (depending on enclosure) |
| Firmware Update Interface | RS232 (Xmodem protocol) |
| Baud Rate Options | 300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200 bps |
| Data Bits | 7 or 8 |
| Parity | None, Even, Odd |
| Stop Bits | 1 or 2 |
| Checksum | Optional (enable/disable via command) |
| LED Indicators | Power, Communication, Status |
| Dimensions / Weight | Compact industrial module (specific dimensions vary by enclosure) |

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### 4. Functionality

The EX9521D functions as an intelligent, addressable converter that allows RS232 devices to communicate over an RS485 network. Each module is assigned a unique address, enabling multiple converters to coexist on the same RS485 bus. The device translates RS485 signals into RS232 format and vice versa, allowing seamless integration between legacy serial equipment and modern networked control systems.

Typical Use Cases:
- Industrial automation and process control systems
- PLC and SCADA communication networks
- Remote data acquisition and monitoring
- Instrumentation and measurement systems
- Serial device networking and expansion

Compatibility:
- Compatible with standard RS232 and RS485 devices
- Supports integration with PCs, PLCs, sensors, and controllers
- Works with standard terminal software (e.g., HyperTerminal) for configuration and firmware updates

Operation:
- Commands are sent via RS485 (COM2) to configure or control the module.
- Data received from RS232 (COM1) is transmitted to the RS485 network, and vice versa.
- The module supports both passive and active communication modes, with internal buffering for asynchronous data handling.

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### 5. Components & Accessories

Included Components:
- EX9521D converter module
- DB-9 male connector for COM1 (RS232)
- Terminal block for RS485 connection
- Power input terminal (10–30 VDC)
- 7-segment LED display

Optional Accessories:
- DIN-rail mounting kit
- RS232/RS485 communication cables
- Power supply adapter (24 VDC typical)
- Configuration software or terminal utility

Connectors:
- COM1 (RS232, DB-9 Male):
1. DCD – Data Carrier Detect
2. RXD – Receive Data
3. TXD – Transmit Data
4. DTR – Data Terminal Ready
5. GND – Signal Ground
6. DSR – Data Set Ready
7. RTS – Request to Send
8. CTS – Clear to Send
9. RI – Ring Indicator

- COM2 (RS485): 2-wire differential pair for data transmission and reception.

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### 6. Installation & Setup

Power Requirements:
Connect an unregulated 10–30 VDC power source to the power input terminals. Ensure proper polarity and grounding.

Mounting Options:
The EX9521D can be mounted on a DIN rail or panel, depending on the enclosure type. Ensure adequate ventilation and protection from moisture or dust.

Configuration Procedure:
1. INIT Mode Activation:
- Power on the module.
- Momentarily connect the INIT* pin to GND to reset configuration.
- Default settings: Address = 00, Baud rate = 9600 bps, Data bits = 8, Parity = None, Stop bits = 1.

2. Program Download:
- Connect COM4 (for EX9521D/22D/23D) or COM1 (for EX9527D) to a PC.
- Use HyperTerminal with settings: 57600 bps, 8N1, no flow control.
- Transfer firmware using Xmodem protocol.
- Disconnect INIT* from GND before completion to avoid system hang.

3. Address and Baud Rate Configuration:
- Use ASCII commands such as `$AAA(addr)` and `$AABN(baud rate)` to set module parameters.
- Configuration is stored in EEPROM for persistence across power cycles.

4. Wiring:
- RS232 devices connect to COM1 (DB-9).
- RS485 network connects to COM2 via terminal block.
- Ensure proper termination and biasing on RS485 lines for stable communication.

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### 7. Performance & Capabilities

- Communication Speed: Up to 115.2 Kbps on both RS232 and RS485 interfaces.
- Addressable Networking: Supports up to 256 unique module addresses (00–FF).
- Buffer Management: Internal buffer stores incoming data from active RS232 devices to prevent data loss.
- Checksum and Error Detection: Optional checksum verification ensures data integrity.
- Command Response Time: Optimized for low-latency communication in multi-node networks.
- Reliability: Hardware watchdog automatically resets the system in case of software or communication failure.
- LED Indicators: Provide real-time status of communication, power, and operational state.
- Limitations:
- Limited to RS232 and RS485 interfaces (no USB or Ethernet).
- Configuration requires serial terminal access.
- Maximum baud rate limited to 115.2 Kbps.

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### 8. Standards & Compliance

- Communication Standards:
- RS232 (EIA/TIA-232)
- RS485 (EIA/TIA-485)
- Electrical Compliance:
- Operates within industrial DC voltage standards (10–30 VDC).
- Environmental Compliance:
- Designed for industrial temperature range (-25°C to +75°C).
- Fanless design suitable for dusty or vibration-prone environments.
- Firmware Protocol: ASCII-based command structure for configuration and control.
- Safety & EMC: Meets general industrial electronic equipment standards (manufacturer-specific compliance details available upon request).

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### 9. Additional Information

Warranty:
Standard manufacturer warranty (typically 1 year) covering defects in materials and workmanship under normal operating conditions.

Technical Support:
Topsccc provides technical documentation, quick start guides, and firmware update utilities. Support is available via email or authorized distributors.

Maintenance:
- Periodically check wiring connections and power supply stability.
- Ensure firmware is up to date using the Xmodem update procedure.
- Avoid grounding INIT* during normal operation to prevent unintended resets.

Firmware Updates:
Firmware can be updated via RS232 using HyperTerminal and Xmodem protocol. The module supports version identification through the `$AAF` command, which returns the current firmware version number.

Command Reference Summary:
The EX9521D supports a comprehensive set of ASCII commands for configuration and control, including:
- `$AAA(addr)` – Set module address
- `$AABN(baud rate)` – Configure baud rate
- `$AADN(data-bit)` – Set data bits
- `$AAPN(parity-bit)` – Configure parity
- `$AAON(stop-bit)` – Set stop bits
- `$AA6(ID)` / `$AA7` – Manage device ID strings
- `$AAC(delimiter)` / `$AAD` – Configure data delimiters
- `$AAKN` – Enable/disable checksum
- `$AATN` – Configure end-of-line characters
- `$AAXV` / `$AAW` – Control and read RTS/CTS states
- `$AAF` / `$AAM` – Read firmware version and module name
- `$AAU` – Retrieve buffered data

Firmware Versioning:
Modules report firmware versions using `$AAF`, returning a 4-character version code (e.g., A2.0, A3.0).

System Recovery:
If the module becomes unresponsive, the watchdog timer automatically resets the system, restoring operation without manual intervention.

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### Summary

The EX9521D is a robust, addressable RS422/485-to-RS232 converter designed for industrial communication networks. With its Intel 80188 CPU, embedded ROM-DOS OS, and flexible configuration commands, it provides a reliable bridge between legacy serial devices and modern RS485 networks. Its wide power and temperature tolerances, fanless design, and watchdog protection make it ideal for demanding industrial environments. The EX9521D offers a balance of performance, configurability, and durability, ensuring dependable operation in automation, control, and data acquisition applications.