Pneumercator MODBUS RTU RS-485 - Terminal Connections

MODBUS RTU Instruction Manual - 2017-11-02.docx Page 5 of 14 November 2, 2017
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.
OUT IN
SHD B
(
-
)
A(
+
)
SHD B
(
-
)
A(
+
)
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.
DWG NO. 20196 REV. A
END-OF-RUN
TMS/LC2000
#2#1
4000 FEET (1200 M) MAX. DISTANCE
TMS/LC2000TMS/LC2000
JUNCTION BOX
MODBUS CARD *
* CARD LOCATION AND ORIENTATION SHOWN FOR REF. EACH CONSOLE
COULD CONTAIN A SINGLE (SHOWN) OR DUAL MODBUS CARD.
MODBUS CARD * MODBUS CARD *
BAS/BMS/PLC
MULTI-PROTOCOL
GATEWAY
MODBUS MASTER
TX
RX
SHDB-A+SHDB-A+ OFF
TERM
ON
TX
RX
SHDB-A+SHDB-A+ OFF
TERM
ON
TX
RX
SHDB-A+SHDB-A+ OFF
TERM
ON