Comtrol DeviceMaster Up, Руководство по установке оборудования

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30 - DeviceMaster UP User Guide : 2000451 Rev. C Connecting Serial Devices
RJ45 Null-Modem Cables (RS-422)
RJ45 Null-Modem
Cables (RS-422) Use the following figure if you need to build an RS-422 null-modem RJ45 cable. A
null-modem cable is required for connecting DTE devices.
Note: RS-422 pinouts are not standardized. Each peripheral manufacturer uses
different pinouts. Please refer to the documentation for the peripheral to
determine the pinouts for the signals above.
Straight-Through
Cables (RS-232/485) Use the following figure if you need to build an RS-232 or RS-485 straight-through
cable. Straight-through cables are used to connect modems and other DCE
devices. For example, a straight-through cable can be used to connect COM2 of one
PC to COM2 to a modem.
RJ45 Loopback
Plugs Loopback connectors are RJ45 serial port plugs, with pins wired together as
shown, that are used in conjunction with application software (Test Terminal or
Minicom) to test serial ports. The DeviceMaster UP is shipped with a a single
loopback plug (RS-232/422).
• Pins 4 to 5
• Pins 1 to 8
• Pins 2 to 6 to 7
RS-485 Test Cable You can use a straight-through cable as illustrated previously, or build your own
cable.
Note: RS-422 pinouts are not standardized. Each peripheral manufacturer uses
different pinouts. Please refer to the documentation for the peripheral to
determine the pinouts for the signals above.
D
e
vic
eMaster
TxD+
TxD-
RxD+
Signal
RJ45
1
4
8
Pins
Fe
m
a
le
RxD+
RxD-
Signal
RJ45
Pins
RxD- 5
TxD+
TxD-
De
vic
eMaster
DB9
1
2
3
4
5
8
6
7
Pins
DCD
RxD
TxD or TRx-
DTR
GND
CTS
DSR
RTS or TRx+
Signal
DCD
RxD
TxD or TRx-
DTR
GND
CTS
DSR
RTS or TRx+
Signal
Fe
m
a
le
RI 9 RI
RJ45
6
5
4
2
3
8
7
1
Pins
N/A
RJ45
6
5
4
2
3
8
7
1
Pins
N/A
DB25
8
3
2
20
7
5
6
4
Pins
22
1 8
Plug
Top View
Cable
The RS-232 loopback plug also
works for RS-422.
TRX-
TRX+
Signal
TRX-
TRX+
Signal
RJ45
4
1
Pins