SEP 2005 MODEL 1000
INSTALLATION AND SETUP
3-44
3.4.3.4 PC-to-GC, Long Distance with RS-422 or RS-485
RS-422 and RS-485 serial protocols are recommended for longer distance serial connections between
the PC and GC System (i.e., distances greater than the 50 feet).
To connect a PC to one of the GC Controller's internal serial port jacks that accept RS-422 or
RS-485 serial protocol, proceed as follows:
(1) Obtain the following equipment:
(a) An asynchronous line driver / interface device with RS-232 input, and RS-422 or RS-
485 output. (See Appendix A, this manual, for example brand and model.)
(b) Shielded, computer-grade, twisted pair cable (to connect the asynchronous line driver
device to the GC).
(c) A straight-through serial cable (to connect the PC to the line driver).
(2) Connect the straight-through serial cable from the PC's serial port to the RS-232 serial port
of the line driver device. Then connect the twisted pair cable to the RS-422/RS-485 serial
port of the line driver.
(3) Configure the line driver for data communications equipment (DCE) operation. (See
Appendix A, this manual, for an example configuration of a "Black Box" brand, model
LD485A-MP "RS-232/RS-485 Multipoint Line Driver.")
(4) Access the GC Controller's Terminal Board for Field Wiring (TB).
(a) If necessary, see instructions provided in Section 3.4.1, step (1).
To Next Page
