Serial Cable Pinouts
                 Pinout List For RS-232 Serial Cables


               DB-25     DB-9     Circuit   Function
                              
                         -----       AA     Chassis Ground
                 2         3         BA     Transmitted Data
                 3         2         BB     Received Data
                 4         7         CA     Request To Send
                 5         8         CB     Clear To Send
                 6         6         CC     Data Set Ready
                 7         5         AB     Signal Ground
                 8         1         CF     Carrier Detect
                12       -----      SCF     Speed Indicate
                20         4         CD     Data Terminal Ready
                22         9         CE     Ring Indicate

The Minimum required pins needed for the modem to operate are: Data,
Signal Ground and Data Terminal Ready (unless DIP 1 is down).

Also, the sources of the signal are:
1 and 7          are supplied by both the Terminal and the Modem
2,4,20           are supplied by the Terminal
3,5,6,8,12,22    are supplied by the Modem</td

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                      For a Macintosh 8-pin DIN:


                 DB-25     Macintosh  
                       
                   2           3      Transmitted Data
                   3           5      Received Data
                   4           1      Request To Send
                   5           2      Clear To Send
                   7           4      Ground
                  20           1      Data Terminal Ready

Note:  On a Mac, the DTR is tied to the RTS line. This makes it
       necessary to override DTR(dip 1 down).