UPS devices  > MGE pinouts
APCUPSD Voltage Signalling Simple-Custom Cable for MGE Pulsar EL 7 UPS Systems

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:

Pin Number
Pin Name
Direction Computer
Pin Number
Pin Name
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

*** -- 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:

DEVICE /dev/ttyS0 (or whatever your serial port is)
9 pin D-SUB male connector layout
9 pin D-SUB male connector
at the UPS towards
9 pin D-SUB female connector layout
9 pin D-SUB female connector
at the Computer towards
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MGE Pulsar EL 7 APCUPSD Simple-Custom Cable visual pinout:
MGE Pulsar EL 7 APCUPSD Simple-Custom Cable diagram
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