SEP 2005 MODEL 1000
SUPPLEMENTAL WIRING GUIDE - SERIAL COMMUNICATIONS
A-12
A.5 EXAMPLE RS-485 CONNECTION FROM PC TO GC
This section demonstrates an example RS-485 connection from a PC to GC that is accomplished
through use of an asynchronous line driver / interface device. The line driver device serves as an
interface between the RS-232 output of the PC and the RS-485 protocol needed for long distance
serial input to the GC. Specifics of the line driver are as follows:
- "Black Box" brand,
- Model LD485A-MP "RS-232/RS-485 Multipoint Line Driver",
- RS-232 input (to connect to the PC), and
- RS-422 or RS-485 output (to connect to the GC).
RS-485 line terminations are illustrated in Figures A-10 and A-11, next page, and jumper and switch
settings to configure the line driver device are listed in Table A-3. (NOTE: For this example, a
straight-through RS-232 serial cable is used to connect between the PC and the line driver.)
See Section 3.4.4, this manual, for additional details about serial communications setups at the
GC Controller.
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