You do not have this cable unless you built it yourself. The Simple-Custom cable is not an Best Power product.
For smart UPSes (such as Best Power Fortress Rackmount) 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 |
| 4 | Signal Ground (Common) | -- | 5 | GND | Ground |
| 5 | Normally Open Low-Battery-Alarm Contact | --> | 8 | CTS | Low Battery |
| 7 | Remote Shutdown | <-- | *** | ||
| 8 | Normally Closed On-Battery Contact | --> | 1 | DCD | On Battery |
| *** | <-- | 7 | RTS | Kill UPS Power | |
| **** | <-- | 4 | DTR | DTR set to +5V by Apcupsd |
* -- look please Best Power Fortress Rackmount pinouts.
** -- look please APCUPSD User Manual | Cables | Simple-Custom Voltage-Signalling Cable for dumb UPSes at www.apcupsd.com
*** -- computer pin 7 (RTS) is connected to base NPN transistor 2N2222 via the resistor 4k7...10k (look please below).
**** -- 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)
----------- -------------
PWR_FAIL 8 <-------------------------------------+-----< 1 DCD
R4 [#] R1
Shutdown 7 <------------------------------+-[##]-+-----< 4 DTR
| [#] R2
LOW_BATT 5 <------------------------------|------+-----< 8 CTS
R1-R4 4k7...10k k\ b R3
VT1 2N2222 (NPN) -----[##]--< 7 RTS
e/
Common 4 <------------------------------+------------< 5 GND
Shield x-------------------------------------------x Shield
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