Relay Contact - NI MES-3980 Hardware Installation Manual

10/100BaseT(X) Ethernet Port Connection
The 10/100BaseT(X) ports located on NI MES-3980's front panel are used to
connect to Ethernet-enabled devices.
Next, we show pinouts for both MDI (NIC-type) ports and MDI-X
(HUB/Switch-type) ports, and also show cable wiring diagrams for
straight-through and cross-over Ethernet cables.
MDI Port Pinouts
Pin Signal
1
2
3
6
RJ45 (8-pin) to RJ45 (8-pin) Straight-Through Cable Wiring
Switch Port
RJ45
Connector
Tx+
Tx-
Rx+
Rx-
RJ45 (8-pin) to RJ45 (8-pin) Cross-Over Cable Wiring
Switch Port
(NIC Port)
RJ45
Connector
(Rx+) Tx+
(Rx-) Tx-
(Tx+) Rx+
(Tx-) Rx-

Relay Contact

The NI MES-3980 has two relay contacts located on the top panel. For detailed
instructions on how to connect the relay contact power wires to the two middle
contacts of the 6-contact terminal block connector, see the Wiring the Relay
Contact section. A typical scenario would be to connect the fault circuit to a
warning light located in the control room. The light can be set up to switch on
when a fault is detected.
The Relay Contact has two terminals that form a fault circuit for connecting to
an alarm system. The two wires attached to the fault contacts form an open
circuit when (1) a relay warning event is triggered, (2) the NI MES-3980 is the
Master of this Turbo Ring, and the Turbo Ring is broken, or (3) start-up failure.
If none of these three conditions occur, the fault circuit will be closed.
MDI-X Port Pinouts
Pin
Tx+
Tx-
Rx+
Rx-
Straight-Through Cable
RJ45 Plug Pin 1
3
6
1
2
Cross-Over Cable
RJ45 Plug Pin 1
3
6
1
2
Signal
1 Rx+
2 Rx-
3 Tx+
6 Tx-
Cable Wiring
Cable Wiring
— 7 —
8-pin RJ45
1 8
NIC Port
RJ45
Connector
3 Rx+
6 Rx-
1 Tx+
2 Tx-
Switch Port
(NIC Port)
RJ45
Connector
1 Rx+
2 Rx-
3 Tx+
6 Tx-
(Tx+)
(Tx-)
(Rx+)
(Rx-)