Description
- Model Number: SCM4.1 (Part Numbers: 2044230022A / 2044230020D)
- Series: Multi-line 2 (ML-2)
- Interface: RS-485 (Isolated)
- Protocols: Modbus RTU (Slave), PLC Interface
- Baud Rate: 9600 to 115,200 bps
- Mounting: Internal plug-in module for DEIF controllers
- Compatibility: AGC-3, AGC-4, GPC-3, GPU-3, PPU-3 series
- Operating Temperature: -25°C to +70°C
- Weight: 0.33 lbs (0.15 kg)
- Dimensions: 3.74 in x 2.16 in x 0.79 in (95 mm x 55 mm x 20 mm)
DEIF SCM4.1 2044230022A 2044230020D
DEIF SCM4.1 2044230022A 2044230020D
DEIF SCM4.1 2044230022A 2044230020D
DEIF SCM4.1 2044230022A 2044230020D
The DEIF SCM4.1 is an essential serial communication expansion module designed for the Multi-line 2 controller range. It provides a galvanically isolated RS-485 interface, enabling the controller to communicate with external systems such as SCADA, Building Management Systems (BMS), or PLCs. By utilizing the Modbus RTU protocol, the SCM4.1 allows for the remote monitoring of engine parameters, electrical values, and alarm statuses, as well as the remote control of start/stop sequences and breaker operations in power management applications.
Model Comparison
The SCM4.1 is the successor to the earlier SCM1 and SCM2 modules. While the SCM1 provided basic RS-232/RS-485 functionality, the 4.1 revision is specifically optimized for high-density integration within the “Slot #2” position of AGC and GPU controllers. The part numbers 2044230022A and 2044230020D represent different hardware revisions; the “22A” is the current standard, offering improved surge protection on the RS-485 data lines compared to the older “20D” version. Unlike the SCM4.2, which is dedicated to CANbus communication (J1939), the SCM4.1 is strictly for Modbus RTU over serial lines.
Operation Tips
- Address Configuration: The Modbus Slave ID is not set on the module itself; it must be configured via the controller’s front panel menu or the DEIF Utility Software (USW) under the “Communication” settings.
- Termination Resistor: RS-485 networks require a 120-ohm termination resistor at both ends of the bus. If the SCM4.1 is the last device in the chain, ensure the external resistor is correctly installed across the A and B terminals.
- Isolation Integrity: Because the SCM4.1 is galvanically isolated, it prevents ground loops between the generator controller and the remote SCADA system, which is vital for maintaining signal stability in electrically noisy engine rooms.
- Firmware Verification: If the module is not detected after insertion, verify that the controller firmware supports the SCM4.1 hardware revision. Older AGC-3 units may require a firmware update to communicate with the “22A” revision of the board.
