Sentry SP400 Instruction Manual download pdf (Page 8)

SMC sierra monitor corporation Sentry Instruction Manual - Version 6

PRODUCT DESCRIPTION

Page: 2

1.4 INTERCONNECT WIRING

Not supplied with Sentry, but necessary to the installation

and operation is the three conductor wiring which connects

the controller to the modules. Before this wiring is

installed it is important to read and understand the

installation instructions (Chapter 3) because significant

economies can be realized by connecting more than one

module onto a common wiring run. This standard feature

is accomplished by multiplexing the signals from the

modules to the controller.

1.5 DATA TRANSMISSION

Transparent to the user is the data transfer which occurs on

the installed interconnect wiring. Two of the conductors

are used to pass direct current (DC) from the controller to

the modules. The third wire transfers a series of very rapid

pulses between the controller and the sensor modules.

This digital transfer of information is an important feature

of the system which significantly reduces RFI and EMI

problems.

1.6 POWER REQUIREMENTS

The standard system requires 120 VAC, 60 Hz, at 0.5

Amp electrical supply. A factory option can be ordered

for 220 VAC operation. DC voltage (12 to 28 VDC) can

be used for standby power. The system will automatically

switch to supplied DC operation at any time the AC

voltage is interrupted.

The system includes a lithium battery for RAM memory

retention during power interruptions. To ensure

continuous trouble free operation, however, the primary

power source must be one which is continuous and

reliable, preferably dedicated to this equipment. Battery

back-up or emergency power is recommended to insure

continuous operation.

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Sentry SP400 Instruction Manual Page 8