Manual 26181 EGCP-2 Communications
Woodward 5
Chapter 3.
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 in one of two ways:
1. Direct cable connection between the computer and the EGCP-2 control(s)
RS-422 network.
2. Remote connection via modem between the computer and the EGCP-2
control(s).
Direct Cable connection between the computer and EGCP-2 control(s) will be
discussed first as it is the most straightforward of the two connection methods.
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 control network. This
conversion is accomplished by an external conversion module, which takes the
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. Consult the EGCP-2
Installation manual for wiring diagrams. A complete cable assembly can also be
purchased from Woodward. The part number is 5417-551.
In a system with multiple (maximum 8) EGCP-2 controls, each control is
interconnected to the others on the RS-422 network in a multidrop fashion.
Modem connections are very similar, but now a modem is required both at the
computer and at the EGCP-2 end of the network. The modem may be an internal
or external type at the computer, and must be an external type at the EGCP-2
control. The conversion from RS-232 to RS-422 communications is made at the
modem connection into the EGCP-2 control network.
For detailed wiring diagrams pertaining to the RS-422 network of the EGCP-2
controls, please consult the EGCP-2 Installation and Operation Manual, number
26174.
To Next Page
Loading...
