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In “RS232” position of DIP switches, RS232 communication with an external device is performed through the
standard DB9 socket shown above. If DIP switches are in “INTERNAL” position, communication through the
standard socket is turned off and routed to an internally connected device. For example, if an ML100 Port
Multiplexer has been installed in the UPS, standard DB9 socket is not used for RS232 communication,
instead, the two ports, COM1 and COM2 on the ML100 can be used for external communication
simultaneously.
8.2 Serial Communication Cable
The maximum length for RS232 communication cable should be 25 meters. Cable connector pin configuration
is as follows:
UPS side PC side
9 Tx 2 Rx
7 Gnd 5 Gnd
6 Rx 3 Tx
For remote panel and UPS connection the same pin configuration is valid.
8.3 Modem Connection
A PDSP Series UPS can be controlled through a normal telephone line by means of a remote operator
connected through a PC with modem device, who performs a phone call to the UPS connected number. So
the operator can see all parameters and control the UPS (if permitted from OPTIONS MENU).
8.3.1 Hardware Configuration
All requirements for modem connection are as follows:
• PC with modem
• WINDOWS 98
• Available UPS control software
• NULL modem which is connected to UPS
In order to perform this function a PC with UPS control software and an external or internal modem device
connected to telephone line are needed.
A NULL modem device, configured according to NULL and auto answer modes, when installed in the UPS
and, once programmed, following a telephone call of the PC-embedded modem, will connect the UPS to the
telephone line.
8.3.2 Functioning Principle
The remote operator, by means of a PC and a modem device and using the remote connection function of the
control software, calls the UPS through the number to which this is connected.
The NULL modem device, connected to the UPS, will answer the call and convert the data coming from UPS’s
serial port on to the telephone line. This way all measurements and controls allowed by the RS232 serial port
can be carried out.
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