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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 |
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 |
|
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). |