UNION SWITCH & SIGNAL
GENISYS II System Hardware Installation
3-16
August 1999
SM-6900B Rev. 0.0
3.4 TYPICAL SERIAL INTERFACE SCHEMATIC DIAGRAMS
1.
DCD biasing resistors (R) are 470 ohm, ½ watt.
2.
For full-duplex Genisys Protocol RTS and DCD need not be connected.
3.
Serial commons are interconnected through the battery that powers the GENISYS II units.
4.
Load resistors (L) are 120 ohm, 1/2 watts and are to be installed externally on the master
and on the most distant slave on the circuit only. Load resistor (Lm) is 240 ohm, ½ watt
and is installed on master DCD only, as shown.
5.
Do not connect serial port common to ground.
F
IGURE
3-3. T
YPICAL
GENISYS II M
ASTER
T
O
GENISYS II S
LAVE
RS-485 D
IRECT
W
IRE
S
ERIAL
I
NTERFACE
U
NITS
P
OWERED
B
Y
S
AME
B
ATTERY
(H
ALF
-D
UPLEX
GENISYS P
ROTOCOL
)
Содержание GENISYS II
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