EIA/TIA-561 Pin
Layout (serial interface via 8-pin connector)
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layouts
Here a useful
pinout for anyone who wants to connect their PC to devices such as key
or PBX (Private Branch eXchange) phone system or
other devices that have a serial port connected to a 8P8C jack. In
fact, phone systems may have more than one port of this kind. For
example, Avaya Partner ACS and Avaya Merlin Magix have two ports with
this pin layout - the Admin port and the SMDR port.
Please note that there are several competing pinouts for this kind of
connection. For example, Cisco console adapter has different pin layout
even though it is also a DB9-to-8-pin connector device.
EIA/TIA-561
Pin Layout Diagram with DB9 connector |
|
The EIA/TIA-561
standard itself only applies to the 8P8C end of such cable. Therefore,
we also provide the DB25 pinout in case your PC has a DB25 serial port
available. Please see the pin assignment table below for DB25-to-DB9
conversion
EIA/TIA-561
Pin Layout Diagram with DB25 connector |
|
EIA/TIA-561
Pin Layout and RS-232 pin assignments |
8P8C (RJ45) |
DB9 |
DB25 |
Signal |
Description |
1 |
9 |
22 |
RI |
Ring Indicator |
2 |
1 |
8 |
DCD |
Data Carrier Detect |
3 |
4 |
20 |
DTR |
Data Terminal Ready |
4 |
5 |
7 |
SG |
Signal Ground |
5 |
2 |
3 |
RXD |
Received Data |
6 |
3 |
2 |
TXD |
Transmitted Data |
7 |
8 |
5 |
CTS |
Clear To Send |
8 |
7 |
4 |
RTS |
Request To Send |
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