In, in, out, out - in, out, in, in.
For best results it would be ideal to be in rather than out.
In the case of the DE9 or DB9 subset of the RS232 standard the pins are configured like this:
1 | Data Carrier Detect | in |
2 | Receive Data | in |
3 | Transmit Data | out |
4 | Data Terminal Ready | out |
5 | Signal Ground | - |
6 | Data Set Ready | in |
7 | Request to Send | out |
8 | Clear to Send | in |
9 | Ring Indicator | in |
Interestingly the 'ins' outnumber the 'outs' by a ratio of 62.5:37.5
Surely it ought to be more equitable however you look at it.
For official/internal use only:
7676
0-9