EGCP-2 Engine Generator Control Package Manual 26174
50 Woodward
Location Description Signal Output Rating
35 Idle Rated/Load SW C (DO12) “
34 Idle Rated/Load SW NO Discrete Output (DO12) “
36 No Connection Isolation Boundary
Communication Ports: RS-485 & RS-422 (1 each)
Location Description Signal
76 + 485 Communication Inter-control Communications
77 – 485 Communication Inter-control Communications
78 485 Shield
79 Communication +5 Vdc Inter-control connection only
80 Communication Reference Inter-control connection only
81 422 Communication RX+ PC interface
82 422 Communication RX– PC interface
83 422 Shield
84 422 Communication TX+ PC interface
85 422 Communication TX– PC interface
Specifications
Communications:
RS-422 protocol
9600 Baud (fixed maximum)
No Parity
1 Stop Bit
Minimum Computer Requirements:
Windows 95
Hardware Connections
Once the software is installed on the computer hard drive, the hardware
connection between the computer and the EGCP-2 control must be made for
correct communication between the two devices. This hardware connection is
completed using a direct cable connection between the computer and the EGCP-
2 control(s) RS-422 network.
Modbus
®
/ServLink Communications
The laptop or desktop computer, which will be used with the EGCP-2 RS-422
port, will have a 9-pin serial port. This port is configured by the computer
hardware to use a serial communications protocol called RS-232. The details of
this protocol are not important to know for hardware connection to the EGCP-2
control(s), other than there is a need to convert the RS-232 protocol of the
computer port to RS-422 protocol used by the EGCP-2 control network. This
conversion is accomplished via an external conversion module, which takes the
9-pin RS-232 serial port input from the computer, and changes it to a RS-422
protocol for the EGCP-2. These converters can be found in most computer or
electronics stores, and are called RS-232 to RS-422 Converters. Woodward
offers a cable, 5417-551, which includes this converter. This cable is designed
for point-to-point communications.
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