GE Industrial Solutions 6KCV301DGF - Manual (Page 10)

—————— Digital General Function Card —————— 10
GEI-100430
RS485
RS232
PC/PLC
RS232
5 9 6 8 3 7
X3 RS485
DGFC
S23=ON
S24=ON
Figure 1.2.2.2: RS-485 single point comm. without signal isolation
The DGF jumpers are:
Name Default Function
S23 ON "ON" RS-485 line end device (for terminal resistor)
S24 ON "ON" RS-485 line end device (for terminal resistor)
d0020g
Figure 1.2.2.3 shows an RS-485 communications link with three 6KCV301DGF cards
with signal isolation.This is the recommended configuration for applications that use
the serial link. The card at the end of the line (both ends) must have the terminator
resistor inserted, and thus S23=S24=ON while the other two 6KCV301DGF cards
must have S23=S24=OFF.
5 9 3 7 5 9 3 7 5 9 3 7
X3 RS485 X3 RS485 X3 RS485
DGFC DGFC DGFC S23=OFF
S24=OFF
S23=OFF
S24=OFF
S23=ON
S24=ON
COM +5V
RS485
Figure1.2.2.3: RS-485 communications with signal isolation
DGF connectors are female connectors. In this configuration, all 6KCV301DGF cards
need external power supply for serial interface.