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|
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CPU <--------- CABLE --------> UPS
1
DCD<-- o----þ---+ +---o |
+++ | | | +- BATT. EMPTY
|R| | white | | o |
|1| +--------- | -----+ |
3 +++ green | |
TD --> o--þ-+------------- | ---------þ UPS - Switch
| | yellow | |
4 | | +--------- | -----+ |
DTR--> o--+-þ | | | o |
|+++ | | +- POWER ERROR
||R| | +---o |
||2| | R1..R2 2x10K Ohm
8 |+++ | 1% - 0.25W
CTS<-- o--+-þ---+
_|_
--- 10nF/400V
5 |C1
SG / GND --- o--+
VENDOR supplied cable !
DB-9 Connector
see >> SERIAL Port (RS-232)
Techn. description:
The Control-cable is included in SW-package. After programstart DTR signal goes high (+9 Vdc)
DCD and CTS are forced high (R1-R2). Transmit Data is low (-9 Vdc) and routed to
the UPS-BATT/POWER failure switches. If one (or both) of this switches is engaged
(short) the negative TD signal should force DCD/CTS to low. The negative DCD/CTS will be recognized
by software, and a (NOVELL) shutdown is initiated, after a customer defined time period.
On some machines (e.g. PC 500 Server) you might have the problem, that this cable
is not functioning, because the resistors R1/R2 have to high resistance
(because DCD and CTS < 3Vdc), maybe resistors >= 1K2 up to 2K7 will work ok?
Please see the LEGAL - Trademark notice.
Feel free - send a 
for any BUG on this page found - Thank you.