Users Manual & Installation Guide
PV- 5127: Power supply module with UPS
Page 15 of 31
RS232
The PV-5127 has a connector (CN3, labelled “RS232”) that can be connected to an RS232 port on
the CPU. The PV-5127 provides two handshake outputs with status information, and one
handshake input for controlling shutdown. The RxD and TxD signals are not used, the only used
signals are Ground and the three handshake signals. The three signals are compatible with the
“simple signalling” or “basic signalling” protocol used by other UPS units.
The 10-pin connector, CN3 is designed to be used with a simple ribbon cable ending in a DB9
female connector to be plugged into a DB9 male RS232 connector on the CPU.
The signals use normal RS232 voltage levels. Inactive (‘0’) = -10V, active (‘1’) = +10V.
In the table shown inputs are indicated by (i) and outputs by (o).
PV-5127 CN3 CPU RS232 DB9
Pin Function Pin RS232 Function
1 Battery low(o) 1 CD Battery low(i)
2 2
3 3
4 UPS_active(i), see note 4 DTR Shutdown(o)
5 5 GND GND
6 Mains failure(o) 6
7 Shutdown(i) 7 RTS UPS_active(o)
8 8 CTS Mains failure(i)
9 GND 9
10
Note: The UPS_active signal is currently unused by the PV-5127.
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