UPS Serial Cables
Here are a couple of (fairly) common cables used for
connecting Uninterruptible Power Supplies (UPSs) to PCs.
APC Smart-UPS
Cable (PN 940-0024B):
DB-9 Male
(UPS end) |
DB-9 Female
(PC end) |
Signal Name |
| N/C |
1 |
N/A |
| 2 |
2 |
Received Data |
| 3 |
3 |
Transmitted Data |
| 1 |
4 |
Data Terminal Ready |
| 9 |
5 |
Signal Ground |
| N/C |
6 |
N/A |
| N/C |
7 |
N/A |
| N/C |
8 |
N/A |
| N/C |
9 |
N/A |
APC Back-UPS
Cable (PN 940-0020B):
DB-9 Male
(UPS end) |
DB-9 Female
(PC end) |
Signal Name |
| N/C |
1 |
N/A |
| N/C |
2 |
N/A |
| N/C |
3 |
N/A |
| 1 |
4 |
Data Terminal Ready |
| 4,9 |
5 |
Signal Ground* |
| N/C |
6 |
N/A |
| N/C |
7 |
N/A |
| 2 |
8 |
Clear To Send |
| N/C |
9 |
N/A |
* I've seen two different configuration, one in
which both 4 and 9 on the male end are connected to 5 on the female
end, and one in which only 4 on the male end is connected to 5 on
the male end.
Here's a set of figures for DB-9 male and female
connectors, as viewed from the pin side (not the solder side).
DB-9 Male
DB-9 Female
