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TP Cable Termination for Ethernet Communication
It is vital that your Ethernet cable be the correct cable type and that it be properly terminated
with the correct pinout. Ethernet links use Category (CAT) 3, 5e, or CAT 6, unshielded
twisted pair (UTP) or shielded twisted pair (STP) cables, terminated with RJ‑45 connectors.
Ethernet cables are limited to a length of 328 feet (100 meters).
The cable can be terminated as either a patch cable or a crossover cable (see figure 5) and
must be properly terminated for the application:
Patch (straight-through) cable — Connection of the device to an Ethernet hub,
•
router, or switch that also hosts a controlling computer.
Crossover cable — Direct connection between the switcher and a controlling
•
computer.
Pins:
1 2 3 4 5 6 7 8
Insert Twisted
Pair Wires
RJ-45
Connector
Figure 6.
Remote RS‑232 Control Wiring
Use a female 9‑pin D connector to bare wire RS‑232 cable or a universal control cable
(UC50' or UC100') to connect your computer or control system to the Remote RS‑232 port
(see figure 7 to wire the 3‑pole connector).
RS-232 Device
Transmit (Tx)
Receive (Rx)
Ground(Gnd)
Figure 7.
1.
Wire the unterminated end of the RS‑232 cable to the 3‑pole captive screw connector
as described below. Connect the transmit, receive, and ground wires of the cable to the
three pins on the connector, starting at the left:
Connect the transmit wire from the RS‑232 device into the Rx pin of the device.
a.
Connect the receive wire from the RS‑232 device into the Tx pin of the device.
b.
c.
Connect the ground wire from the RS‑232 device into the G pin of the device.
2.
Plug the 3‑pole connector into the RS‑232 port on the rear panel of the transmitter.
3.
Connect the other end of the cable to a control system or the device being controlled.
Crossover Cable
(for direct connection to a PC)
End 1
End 2
Pin
Wire Color
Pin
Wire Color
1
white-orange
1
white-green
2
orange
2
green
3
white-green
3
white-orange
4
blue
4
blue
5
white-blue
5
white-blue
6
green
6
orange
7
white-brown
7
white-brown
8
brown
8
brown
T568B
T568A
A cable that is wired as TIA/EIA T568A at one
end and T568B at the other (Tx and Rx pairs
reversed) is a "crossover" cable.
RJ-45 Pin Assignment for Ethernet Communication
Bidirectional
Transmit (Tx)
Receive (Rx)
Ground(Gnd)
Remote RS-232
Straight-through Cable
(for connection to a switch, hub, or router)
End 1
End 2
Pin
Wire Color
Pin
Wire Color
1
white-orange
1
white-orange
2
orange
2
orange
3
white-green
3
white-green
4
blue
4
blue
5
white-blue
5
white-blue
6
green
6
green
7
white-brown
7
white-brown
8
brown
8
brown
T568B
T568B
A cable wired the same at both ends is called
a "straight-through" cable because no pin/pair
assignments are swapped.
RS-232
DTP2 T 203 • Installation
13
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