Sine Systems RFC-1/B Instruction Book

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+ telemetry terminal
- telemetry terminal
(on RP-8 panel)
The DC power supply can be anywhere from +5 to +20 volts. The LM34 draws only about 70
pA so one small power supply will operate a virtually unlimited number of sensors. The two
.IpF caps and 75 ohm resistor help avoid problems with RF at transmitter sites but may not
be necessary depending on local conditions. Use shielded wire for long runs in high RF fields.
After connecting to your relay panel, use a thermometer to calibrate the telemetry to the
correct temperature. The following parts can be obtained from the Digi-Key Corporation
(telephone 1-800-344-4539):
Digi-Key part number: Price:
Description:
T401-ND
LM34CZ or LM34DZ
P4525
75Q
$4.82
$7.20
$ .19
$ .26 (for 5)
9 volt wall plug power supply
temperature sensor (+5°F to 203. 9°F)
. IpF capacitor
resistor, carbon film, 75 ohm, 1/4 watt, 5%
Prices shown are from the summer 1991 catalog. A $5.00 service charge is added to orders
under $25.00.
It is possible to use the +10 volt unregulated voltage source already present on the RP-8
panels to power temperature sensors but this should be done with great caution. Connecting
leads of any significant length to this source could expose the power supply buss in the RFC- 1
to damaging transients. Also remember that the RFC-1 has a floating power supply and the
circuit common should remain floating (not grounded).
Dedicated Control Port
In addition to being operable from a dial-up telephone line, the RFC-1 may also be operated
from a non-dial-up communications link such as a dedicated line, a two way radio, a pager.
an STL/SCA link, etc. This additional control method may be used in place of a dial-up line or
in addition to a dial-up line for the purposes of an alternate or back-up control and
monitoring means. The port used for the dedicated communications link is the modular jack
on the front panel of the RFC-1 labeled "TELEPHONE." This is a dual-purpose jack.
Depending on user programming, the "TELEPHONE" jack can be connected to a local
telephone for ordinary use and for local control and telemetry calibration, or it can become a
continuously active "dedicated control port" which can be used in addition to the dial-up port
("LINE" jack) or in place of it. The dedicated control port may be used in a number of different
ways and the operational details will be determined by the communications system used and
the particulars of the installation.
3.00.2
Installation
page 5.12

Sine Systems RFC-1/B Specifications

General

Brand	Sine Systems
Model	RFC-1/B
Category	Remote Control
Language	English