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XNX Universal Transmitter
normally energized indicating proper operation. In the event of
power failure or fault, the C-NO connection will open.
TB4
Remote
Reset SW
Relay Ratings
250VAC 5A
24VDC 5A
3-1
NC
3-2
C
3-3
NO
3-4
NC
3-5
C
3-6
NO
3-7
NC
3-8
C
3-9
NO
TB-3 RELAY
Warning: Power
externally supplied.
Disconnect at source
prior to servicing.
Figure 57. XNX relay option board terminal blocks
Installation and Operation
1
2
3
4
TB3
5
6
7
8
9
TB4
1
2
TB3 Relay Connections
Warning: Power externally
supplied, disconnect at source
prior to servicing
Relay Contact Ratings:
250 VAC 5 amps
24 VDC 5 amps
Modbus
The optional Modbus interface allows all transmitter local user
interface functions and parameter settings to be transmitted.
Relay
Modbus is a master-slave protocol. Only one master (at a time) is
TB3
NC
connected to the bus. Modbus communication is always initiated
C
by the master. The slave nodes never transmit data without
NO
receiving a request from the master node. The slave nodes never
NC
communicate with each other. The master node initiates only one
C
Modbus transaction at a time.
NO
NC
C
NO
R
=120
T
TB4
TB-3 Modbus
1
3-1
2
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 58. Modbus option board terminal block/jumper switch
59
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.
S5 EOL Term
Similarly, terminal 3-3 is connected to 3-4
SW5 - Loop Termination
+
+
-
-
A
A
B
B
S
S
TB3 Modbus Connections
Use Jumper
to maintain
connection
during service
Modbus
TB3
1
+
2
+
3
-
4
-
5
A
6
A
7
B
8
B
9
S
10
S
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