MANUALPC-2010 CHAPTER II – INSTALLATION Page 11
Backup Battery
The 3V Backup Battery is located on the left side of the Mother
Board (Error! Reference source not found.). It is used to
maintain the memory settings in case of loss of AC power.
This battery is designed to last for several years in normal
operation.
Under normal conditions, the controller will operate without
battery power. However, the clock and other memory settings
will have to be restored in case of complete power shutdown.
Replace the battery if the voltage falls below 2.6 V. The
voltage is displayed in Configuration Menu / Battery Submenu.
Remote Communications
T
he Remote Communications option connects the modem with
a standard US-type, 6-position RJ12 phone jack located on the
center right hand side of the Mother Board (Error! Reference
source not found.).
If possible, connect the controller to a direct outside telephone
line dedicated for remote operation. If the line is also used for
voice communications, users should wait for at least three
rings to allow the modem to answer a call.
The modem is a combination Data/Fax/Voice multimedia
device registered by the Federal Communications Commission
(FCC), Number B46USA-22429-MN-E.
MODEM SPECIFICATIONS
FCC Registration Number
B46USA-22429-MN-E
Ring Equivalency Number
(REN) 0.2 A
The Ring Equivalency Number (REN) is 0.2 A. Most telephone
companies require that the sum of all devices connected to a
telephone line do not exceed 5. If a problem arises as a result
of operating this equipment, you may have to provide
information about this modem to the Phone Company or to the
FCC. If the equipment causes disruption to the telephone
network, the Phone Company may disconnect your service.
Multiple Serial Connections (Option)
Up to thirty (30) CHEMTROL® PC controllers can be
multiplexed to a single phone line or a single computer line by
using a network consisting of a host and several slaves. The
connections are made through RS485 Serial Ports (Option
RS485).
Different models of CHEMTROL® PC controllers can be mixed
and matched in a network. Each controller has its own ID
number. This number is set up through software in the
Communications Submenu 8.3.1 (see Page 30)
As shown in Figure 6, the host controller includes a modem
and an RS485 connection (Option REM). It is connected to the
telephone line by modem or to a computer equipped with an
RS485 communication card. The slave units need only an
RS485 connection (no modem needed) and an internal ID
number.
Any controller can be set up at any time as either host or slave
by orienting the jumper JP9 as marked on the motherboard
(Error! Reference source not found.).
The slave units must be located within 3,000 feet of the host
controller and connected with two Category 5 wires (one pair).
The RS485 terminal has four terminals, only two of which,
marked A and B, are used. Each unit must be wired A to A
and B to B for proper communications. The slave units can be
connected directly to the host unit or through any other slave
units.
CAUTION: Do not wire the connections marked 24 VDC or
GND on the RS485 terminal. This could cause
serious damage to the terminal.
Figure 6 - Multiplex Connections
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