Emerson Rosemount 700XA Reference Manual page 129

July 2020
Change the line drivers
The following table lists the relevant traits of the gas chromatograph's (GC's) serial ports.
Port name
Port 0
Port 1
RS422, RS485
Port 3 (DB9 connector)
Note
You can use Port 3 to connect directly to the personal computer (PC).
WARNING
EXPLOSION HAZARD
Failure to de-energize the analyzer may cause an explosion and severely injure personnel.
Do not open the enclosure unless the area is known to be non-hazardous or unless all devices within the enclosure have been de-
energized.
WARNING
HOT SURFACES
Failure to allow the analyzer to cool may cause burns from hot surfaces in the enclosure.
Power down the GC and allow it to cool for at least five minutes.
The factory setting for each port is RS232. To change the setting of a serial portL
Procedure
1. Start MON2020 and connect to the GC.
2. Select Applications → Communication.
The Communication window displays.
Rosemount 700XA
Terminal block
Port mode location on the
backplane
RS232 TB1
RS422, RS485 TB2
RS232 TB5
Port 2 RS232
TB9
RS232 J23 (Laptop-PC)
Communication
modes supported
TB8
®
Modbus ASCII/RTU
Modbus ASCII/RTU
Direct Connection
through MON2020
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