You do not have this cable unless you built it yourself. The Simple-Custom cable is not an MGE product.
For dumb UPSes (such as MGE Pulsar EL 7) using voltage signalling, if you are going to build your own cable, we recommend to make the cable designed by the apcupsd team as follows:
|
UPS* Pin Number |
UPS* Pin Name |
Direction |
Computer Pin Number |
Computer Pin Name |
Description** |
|---|---|---|---|---|---|
| n/a | Shield | -- | n/a | Shield | Frame/Case Ground |
| 3 | Remote Shutdown | <-- | 7 | RTS | Kill UPS Power |
| 4 | Normally Closed On-Battery Contact | --> | 1 | DCD | On Battery |
| 5 | Signal Ground (Common) | -- | 5 | GND | Ground |
| 7 | Normally Open Low-Battery-Alarm Contact | --> | 8 | CTS | Low Battery |
| *** | <-- | 4 | DTR | DTR set to +5V by Apcupsd |
* -- look please MGE Pulsar EL 7 UPS Systems communication port pinouts.
** -- look please APCUPSD User Manual | Cables | Simple-Custom Voltage-Signalling Cable for dumb UPSes at www.apcupsd.com
*** -- computer pin 4 (DTR) is connected to computer pin 1 (DCD) via the resistor 4k7...10k, and also it is connected to computer pin 8 (CTS) via the resistor 4k7...10k.
UPS (DB9M) IBM PC (DB9F)
----------- -------------
Shutdown 3 <------------------------------------------< 7 RTS
Common 5 <------------------------------------------< 5 GND
PWR_FAIL 4 <---------------------------+--------------< 1 DCD
[#] R1 4k7...10k
+--------------< 4 DTR
[#] R2 4k7...10k
LOW_BATT 7 <---------------------------+--------------< 8 CTS
When using this cable with apcupsd specify the following in apcupsd.conf:
UPSCABLE simple
UPSTYPE dumb
DEVICE /dev/ttyS0 (or whatever your serial port is)
correct
incorrect