Pneumercator MODBUS RTU RS-485 Instruction Manual page 5

1.3 Terminal Connections
Plug-in terminal block TB1 is provided for connection to the RS-485 Modbus. Note that both input
and output terminals are provided to support multi-drop wiring.
SHD
1.3.1 Cabling
Cable type should be twisted pair, shielded, and designated for RS-485 communications having a
nominal impedance of 120 ohms. Maximum cable distance supported is 4000' as per below drawing.
See 3.0 Product Specifications for example part numbers.
MODBUS MASTER
MULTI-PROTOCOL
GATEWAY
BAS/BMS/PLC
MODBUS RTU Instruction Manual - 2017-11-02.docx
OUT
B(-) A(+)
#1
TMS/LC2000
MODBUS CARD *
RX
TX
TERM
ON
OFF
4000 FEET (1200 M) MAX. DISTANCE
* CARD LOCATION AND ORIENTATION SHOWN FOR REF. EACH CONSOLE
COULD CONTAIN A SINGLE (SHOWN) OR DUAL MODBUS CARD.
Page 5 of 14
IN
SHD B(-)
#2
TMS/LC2000
MODBUS CARD *
RX
TX
TERM
ON
OFF
JUNCTION BOX
A(+)
END-OF-RUN
TMS/LC2000
MODBUS CARD *
RX
TX
TERM
ON
OFF
DWG NO. 20196 REV. A
November 2, 2017