User guide

MODBUS RS-485 CARD
REFERENCE MANUAL
5
For using only one (1) RS485 card with remote panel with distance shorter than 1.5
meters, a RJ-45 to DB9 cable converter can be used:
For using only one (1) RS485 card with remote panel with distance longer than 1.5
meters, special converter must be used:
RS485 to RS232 converter
RS485 to Modbus/TCP converter
For using multiple RS485 cards & remote panel connected to PC at same time must
be used 1 of 2 converters mentioned previously.
RS485 to RS232 converter
RS485 to Modbus/TCP converter
MODBUS RS-485 CARD
REFERENCE MANUAL
6
NETWORK TOPOLOGY & RESISTOR CONFIGURATION:
Configure RS-485 Resistance:
Configure using switches from 6 to 8 in SW2
Function Bit # Set Configuration
Push up
resistance
# 6
ON Enable (Default)
OFF Disable
Push down
resistance
# 7
ON Enable (Default)
OFF Disable
Termina te
resistance
# 8
ON Enable (Default)
OFF Disable
Master Device Intermediate Device End of Line Device