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RS - 232 Null Modem Cable
If you are using the internal clocking option of the controller card, you will require this cable. We recommend that you use an "I-E" synchronous null modem cable as an extension to the standard RS-232. The "I" end is connected to a link that is internally clocked, where we provide our transmit clock. The "E" end is connected to a device that wants externally provided clocks.
This cable also swaps Receive and Transmit Data and other EIA signals, so that it is a modem eliminator, or null modem cable. Because of this, DO NOT USE THE I-E JUST TO CONNECT TWO MALES TOGETHER.
The on-line manuals contain information on connecting two machines together without a network, using this cable.
For Direct Connection
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DCE |
Standard modem cable Or one leg of Y cable |
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Other X.25 DTE |
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I-E Cable
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| Internally Clocked Clock
Provider Description |
Pin Number |
Externally Clocked Clock
Acceptor Description |
GND, Common Signal Ground |
1 |
1 |
GND, Common Signal Ground |
RD, Receive Data |
3 |
2 |
TD, Transmit Data |
TD, Transmit Data |
2 |
3 |
RD, Receive Data |
CD, Carrier Detect |
8 |
4 |
RTS, Request to Send |
DTR, Data Terminal Ready |
20 |
6 |
DSR, Data Set Ready |
w |
w |
5 |
CTS, Clear to Send |
GND, Common Signal Ground |
7 |
7 |
GND, Common Signal Ground |
RTS, Request to Send |
4 |
8 |
CD, Carrier Detect |
RC, Receive Clock |
17 |
15 |
TC, Transmit Clock |
XTC, DTE Clock |
24 |
17 |
RC, Receive Clock |
w |
15 |
w |
w |
CTS, Clear to Send |
5 |
20 |
DTR, Data Terminal Ready |
DSR, Data Set Ready |
6 |
w |
w |
Rx=Receive, Tx=Transmit, CTS=Clear to Send, RTS=Ready to Send,
DTR=Data Terminal Ready, DSR=Data Set Ready, DCD=Data Carrier Detect
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