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Port Name Port Mode
Terminal Block Location
on the back plane
Communication Modes Sup-
ported
Port 0 RS232 TB1 Modbus ASCII/RTU
RS422,
RS485
TB2
Port 1 RS232 TB5 Modbus ASCII/RTU
RS422,
RS485
TB6
Port 2 RS232 TB8 Modbus ASCII/RTU
RS422,
RS485
TB9
Port 3 (DB9 connec-
tor)
RS232 J23 (LAPTOP-PC) Modbus ASCII/RTU
Direct Connection through
MON2020
Note
Port 3 can be used to set up a direct-to-PC connection.
The factory setting for each port is RS-232. To change the setting of a serial port, do the
following:
1. Start MON2020 and connect to the GC.
2. Select Communication... from the Applications menu. The Communication
window displays.
3. Select the appropriate mode from the Port drop-down list for the appropriate serial
port. The options are RS232 or RS485 or RS422.
4. Click OK.
5. Close MON2020.
6. Turn off the GC.
7. Locate and remove the Base I/O board, which is located in the card cage in the GC’s
lower enclosure.
8. Consult the following figures, which show the correct switch settings for each mode.
The first column lists the port number; the first row lists the communications mode.
The table cell at which the desired port and the desired mode intersect contains the
appropriate switch settings for that configuration.
Port 0 corresponds with channel “1” on each switch; Port 1 corresponds with
channel “2” on each switch; Port 2 corresponds with channel “3” on each switch.
Operation and maintenance
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Operation and maintenance
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