Example Rs-485 Connection From Pc To Gc - Emerson Daniel Danalyzer 1000 Hardware Reference Manual

SEP 2005
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.
A-12
SUPPLEMENTAL WIRING GUIDE - SERIAL COMMUNICATIONS
MODEL 1000