Rj11 serial cables and loopback plugs (8j), Rj11 pinouts, Rj11 null-modem cables – Comtrol RocketPort Universal PCI User Manual
Page 19: Rj11 null-modem cable (rs-232), Rj11 null-modem cable (rs-422), Rj11 pinouts rj11 null-modem cables
RocketPort Universal PCI User Guide: 2000284 Rev. G
Connecting Serial Devices - 19
Connecting Serial Devices
RJ11 Serial Cables and Loopback Plugs (8J)
This subsection describes RJ11 cables and looback plugs.
•
•
•
The RocketPort Universal PCI has eight standard RJ11 modular connectors,
located on the controller board mounting bracket. The ports are numbered 0
through 7, with Port 7 being the connector closest to the bus.
There are no standards for the RJ11. Before you build the custom RJ11 serial
cable for your terminal equipment or device you should:
•
Refer to the manufacturer’s installation guide if you need help with connector
pinouts or cables for the peripheral device.
•
Supported RS-modes are described in the electronic document shipped with
your Comtrol device.
RJ11 Pinouts
This topic describes pinouts for the RJ11 interface
connector for an RS-232 port. The following figures
provide pinout information for the RJ11 jack plug
and receptacle.
RJ11 Null-Modem
Cables
You need a null-modem cable to connect to DTE devices. For example, you can
connect one end of a a null-modem cable to COM2 on one computer and the other
end of the null-modem cable to COM2 on another computer.
RJ11 Null-Modem
Cable (RS-232)
Use the following figure if you need
to build an RS-232 null-modem
cable. A null-modem cable is
required for connecting DTE devices.
RJ11 Null-Modem
Cable (RS-422)
Use the following figure if you need to build
an RS-422 null-modem cable. A null-modem
cable is required for connecting DTE devices.
Note: RS-422 pinouts are not standardized.
Each serial manufacturer uses
various pinouts. Please refer to the
documentation for the serial to
determine the pinouts for the signals
in the previous picture.
TxD
RxD
Signal
RxD
TxD
RTS
Signal
DB25
3
2
Pins
RJ11
3
4
Pins
4
RocketPort
DTE Serial Device
DB9
2
3
7
Pins
CTS
6
DCD
DTR
DCD
DTR
20
5
1
8
1
14
GND
GND
7
2
5
RS-232
TxD+
TxD-
RxD+
Signal
RJ11
1
3
6
Pins
RxD+
RxD-
Signal
RxD- 4
TxD+
TxD-
DTE Serial
Device
RocketPort
RS-422