35
Communications
RS-232 Peripheral Equipment Requirements
The RS-232 port allows you to connect the console to a serial printer, modem or terminal.
Any peripheral equipment connected to an RS-232 serial port must meet the following criteria:
1.
Peripheral equipment must be UL listed.
2.
The equipment must have an EIA standard RS-232C or RS-232D communications protocol.
3.
The equipment must NOT be installed over or in a hazardous location.
RS-232 Connections
TO A DEVICE LESS THAN 50 FEET (15 METRES) FROM THE CONSOLE
Veeder-Root recommends that you use a null-modem cable no longer than 50 feet for direct connections between
the console and a remote device. Cable runs longer than 50 feet can result in data errors, component damage, or
both.
TO A DEVICE MORE THAN 50 FEET FROM THE CONSOLE
If cable runs longer than 50 feet are needed, two short-haul modems should be used, one at the console and one
at the remote device. We recommend an asynchronous short-haul modem, Black Box model ME800A, or
equivalent, at the console and at the remote device. For more information on the ME800A, you can contact Black
Box at P.O. Box 12800, Pittsburgh, PA 15241, U.S.A., phone: 1-412-746-5500, fax: 1-412-746-0746, or at their
Internet address
http://www.blackbox.com.
Figure 26 illustrates how to connect two ME800A short-haul modems between the console and a remote personal
computer.
Connections to telephone lines must meet the following criteria:
• Connection to telephone equipment is subject to local regulations.
• Maximum short circuit current: 0 amperes.
• Maximum open circuit voltage: 0 volts.
Surge Protection for Communication Devices
In locations that are subject to high levels of noise and power surges, the use of a surge protector is
recommended. The following models are available from B&B Electronics, telephone 1-815- 433-5100, or at their
Internet address
http://www.bb-elec.com:
• Telephone Line Surge Protector, model TLSP
• RS-232 Surge Protector, model 232DSP
