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64
Level
trOll
Operator’s Manual
0052210 rev. 006
seCtion 8: anaLoG, sdi-12, modBus
RS485
RS232
***
Required if port power is not available
DB9F
TD(A)
TD(B)
GND
GND
+12V
RS485 (–)
green
RS485 (+)
blue
**
pin
5
gnd
pin
3
txd
pin
2
rxd
GND/RETURN
black
***
ExT PWR
red
***
Converter
Port-Powered RS485 converter,
such as B&B Electronics Model
485SD9TB
modbuS maSter
with RS232 built in (converter required)
*
Voltage limited by converter
**
Orange for Tefzel cable
ExT PWR
red
GND/RETURN
black
Digital PLC
12 VDC
*
Modbus
Slave
RS485 (–)
green
RS232 (RxD)
RS232 (TxD)
Converter
Gnd +12V
RS485 (+)
blue
**