3�3 Modbus - Honeywell XNX Quick Start Manual

3�3 Modbus
®
Modbus connections to the XNX are made through a pluggable terminal block on
®
the Modbus interface circuit board. A loop termination point (SW5) is included on
®
the Modbus interface board to provide termination of the Modbus
®
R =120
T
TB-3 Modbus
3-1
3-2
3-3
3-4
3-5
3-6
3-7
3-8
3-9
3-10
Use shorting jumper
supplied to maintain
connection during
service
Figure 25. XNX Modbus
34
S5 EOL Term
SW5 - Loop Termination
+
+
-
-
A
A
B
B
S
S
TB3 Modbus Connections
Option Board Terminal Block and Jumper Switch
®
Terminals 3-1 through 3-4 are provided to facilitate bus
wiring; there is no internal connection to other XNX
circuitry. Terminal 3-1 is connected internally to 3-2.
Similarly, terminal 3-3 is connected to 3-4
Use Jumper
to maintain
connection
during service
XNX Universal Transmitter Quick Start Guide
loop.
®
Modbus
®
TB3
1
+
2
+
3
-
4
-
5
A
6
A
7
B
8
B
9
S
10
S