Peripherals Manual RS232 Bus Amplifier (P/N 812-1800) • 9
RS232 Bus Amplifier (P/N 812-1800)
Overview
The RS232 Bus Amplifier (P/N 812-1800), shown in
Figure 5, is used to connect CPC products together as an
integrated communications system. Communication prob-
lems sometimes associated with large computer systems—
such as limited cable lengths, data rate limitations, and ter-
minal and modem communication interference—are elim-
inated through the use of the RS232 Bus Amplifier
Features
• Allows the use of long cable runs
• Works with high data rates (9600 baud) Allows
for remote modem set-up
• Eliminates modem interference while using the
local terminal
• Eliminates terminal interference when accessing
the site from a remote computer
• Improves local terminal data retrieval from CPC
products
• Eliminates the use of custom cables for modems
and local terminals
Installation
Power
Power is supplied to the RS232 Bus Amplifier through
a standard power cord, allowing the amplifier to use the
same wall outlet as the modem and local terminal. The
RS232 Bus amplifier may be powered by 120 volts or 208
to 250 volts. An internal jumper selects which voltage
range will be used. AC power may be either 50hz or 60hz.
Location
Although there are no specific location requirements
for installation of the RS232 Bus Amplifier, it is recom-
mended that the amplifier be located close to the bussed
CPC controllers to prevent data loss over long cable
lengths. It is also recommended that the bus amplifier be lo-
cated adjacent to the modem and, if present, the local com-
puter terminal to provide easy access to all components
necessary for refrigeration system monitoring.
Mounting
To mount the RS232 Bus Amplifier, an installation en-
velope eight inches wide, nine inches high, and three inches
deep is required.
1. Remove the four front panel screws.
2. Remove the front panel (with circuit board at-
tached)
3. Mount the empty amplifier body with the
plain edge down using four #8 (4mm) or #10
(5 mm) screws.
4. Remount the front panel.
.
Figure 5 - RS232 Bus Amplifier
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