In-Situ Aqua TROLL 100 and 200 Operators Manual - Manual (Page 77)

Page 77 Aqua TROLL Operator’s Manual
RS485 RS232
***Required if port power is not available
Maximum cable length 20 ft between Converter and Master
Maximum cable length 4000 ft between Master and Slave
DB9F
TD(
A) TD(B) GND GND +12V
RS485 (+) BLUE
RS485 (–) GREEN
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
EXT PWR RED
GND/RETURN BLACK
Digital PLC
12 VDC*
Modbus
Slave
RS485 (–) GREEN
RS232 (RXD)
RS232 (TXD)
Converter
Gnd +12V
RS485 (+) BLUE
Section 8: Analog, SDI-12, Modbus