MODEL 1000 SEP 2005
INSTALLATION AND SETUP
3-47
The front panel serial port on the GC Controller is configured for RS-232, by default, and is
connected to the Controller's serial port COM1. Consequently, the Controller's COM1 is
usually reserved for direct serial communication between the Controller and a PC.
A telephone Modem Board plugs into the COM4A Board and can be configured for RS-232.
For directions on how to connect a modem to the GC Controller, see Appendix F.4 and the
MON2000 Software for Gas Chromatographs User Manual (P/N 3-9000-522).
Serial ports configured for RS-422 or RS-485 are most commonly used for long distance serial
communications systems, such as a Data Collection System or a multi-drop serial data highway
network. For these systems, the GC Controller can communicate as a Modbus slave device.
In any Modbus host-slave DCS or multi-drop serial data highway network, there must only be
one host--to which any one of the GC Controller's serial ports can respond as a Modbus slave.
(With four serial ports, the GC Controller could be connected to a maximum of four different
serial data networks).
For more details about using the MON2000 Software to configure the GC Controller for
Modbus communication (and determining contents of the Controller's Modbus registers), see
the MON2000 Software for Gas Chromatographs User Manual (P/N 3-9000-522).
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