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Figure 401
401 Connecting a Terminal or Computer to the RS232 Port
CAUTION
Do not make connections to the RS232 communication port if FERRUPS is connected to a positive
ground battery system. The RS232 ground must be isolated or equipment damage will result. For
help, call Best Power’s Worldwide Service at 1-800-356-5737 or 1-608-565-2100, or call the nearest
Best Power office.
If you are connecting a terminal to the RS232 port, the terminal must be capable of serial communications.
If you are connecting a computer, the computer must be running terminal emulation software. Many popular
modem software packages can emulate a terminal; if you do not have a terminal emulation program, please call
Best Power’s Worldwide Service for more information.
1. To connect FERRUPS’ DB25S (female) RS232 port to your terminal or computer, you will need a cable
designed specifically for this purpose. (See Figures
.) Best Power offers cables for computers or
terminals using 25-pin or 9-pin serial ports; call your local Best Power office to order one of these cables. If
you would like to build your own cable, follow these requirements:
Use a high-quality, shielded cable.
Do not use a standard 25-conductor straight-through cable; you should only include straight-
through connections for the pins shown in Figures 401-402. For RS232 communication, use pins 2
(transmit data), 3 (receive data), and 7 (signal ground); to use hardware handshaking (request to send
on pin 4 and clear to send on pin 5), please call Best Power’s Worldwide Service or the nearest Best
Power office. No other pins should be connected from FERRUPS’ RS232 port to your terminal or
computer.
For more information on pin connections and the function of the non-serial pins on the RS232 port, see the
beginning of
Note:
To connect a modem, see TIP 503.
Computer DB9 to UPS
