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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

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