Allen-Bradley 1203-GD1 I/O Communication Module

The Allen-Bradley 1203-GD1 is a specialized communication module within the Rockwell Automation ecosystem, specifically designed as a SCANport to RS-232/RS-422/RS-485 Communications Adapter.

It serves as a bridge, allowing legacy Allen-Bradley drives and devices that use the SCANport protocol to communicate with computers, controllers, or other serial-based devices.

1. Product Specifications

The 1203-GD1 provides a physical and logical link between a serial port and a drive’s SCANport.

2. Key Product Advantages

• Versatile Compatibility: Supports multiple serial standards (RS-232/422/485) in a single unit, making it adaptable to various industrial environments.

• Plug-and-Play Integration: It derives power directly from the drive’s SCANport, eliminating the need for an external power supply.

• Diagnostics: The built-in LED indicators provide instant feedback on communication health, making troubleshooting significantly faster.

• Legacy Support: Essential for maintaining and monitoring older Allen-Bradley hardware (like 1336 PLUS or PowerFlex 70 legacy versions) without upgrading the entire control architecture.

3. Product Applications

The 1203-GD1 is primarily used for configuration, monitoring, and data collection.

• Drive Configuration: Connecting a laptop running software like DriveExplorer or DriveExecutive to a drive to upload/download parameters.

• HMI Integration: Linking a serial-based Human Machine Interface (HMI) to a drive for operator control.

• Data Logging: Connecting a PLC or PC to pull real-time diagnostics and performance data from the drive via the DF1 protocol.

• Network Bridging: Acting as a gateway for controllers that lack native SCANport support but have available serial ports.

4. Important Considerations & Precautions

Note: Proper configuration of the internal DIP switches is critical before powering on the device.

• DIP Switch Settings: You must manually set the internal switches to match your desired baud rate and communication protocol (RS-232 vs RS-485).

• Cable Lengths: While RS-422/485 supports long distances, RS-232 connections should typically be kept under 15 meters (50 feet) to avoid signal interference.

• Environmental Limits: Ensure the module is installed in an environment free from conductive dust and within the specified temperature range to prevent overheating or short circuits.

• Termination: If using RS-485 in a multi-drop configuration, ensure proper termination resistors are used at the end of the line.

5. Typical Hardware Connection

1. SCANport Side: Connects to the drive’s communication port via a male-to-female SCANport cable.

2. Serial Side: Connects to the host device (PC/PLC) using a standard 9-pin D-shell connector.