MODEL 1000 SEP 2005
MAINTENANCE
5-33
5.7 COMMUNICATIONS
See Section 3.4.4, this manual, for a list of the GC Controller ports and terminals (pins)
assigned to serial communications.
There are 3 to 8 communications ports available from the GC Controller. In addition, a
communications port (8) is used by the GC Controller display and keypad. The GC
Controller/display link uses either RS-232C or RS-422 protocols. Communications using RS-232C
or RS-485 protocols are available in the additional external ports. The communication protocols are
selected inside the GC Controller by changing jumpers. These jumpers are normally specified by the
customer at the factory. If it becomes necessary to change the communications at the site, access to
the boards inside the enclosure is required to change the data interface chips. The enclosure should
not be opened when hazardous gases are present. Refer to paragraph 5.6.1 if a communications
change becomes necessary.
The Data Interface Chips to be changed are located on the CPU Board. On the CPU Board, the
standard configuration would be both channel 1 and 2 RS-232C.
Optional Chip configurations for the communications ports are:
If: RS-232 (1) large dip chip
RS-485 (1) small dip chip
RS-422 (2) small chips
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