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ORDERING INFORMATION
NOTE: This section lists the different options available for this product. To order any of the avail-
able options, contact Dantel Inside Sales through our toll-free number, 1-800-432-6835.
OPTION NUMBER
B12-49009-00
GENERAL DESCRIPTION
CIRCUIT DESCRIPTION
P
2
AGE
FEATURES
RS-232 Current Loop Interface Subassembly
T
he 49009 Current Loop Interface Subassembly provides a
bi-polar current loop or EIA Standard RS-232 data communi-
cations interface for use with the 460 Alarm and Control Sys-
tem.
T
he 49009-00 Current Loop Interface Subassembly functional
schematic is shown in Fig. 1.
The input (RCV) to the subassembly appears at pins 2 and 4 on
connector P5. The RCV circuit uses a series of inverters which
activate when data comes in. The Data Carrier Detector (DCD)
is also activated through this circuitry. Depending upon strap-
ping, the RCV accepts bi-polar or EIA Standard RS-232 type
data signals and provides the result to the host module at the
RCV (pin 8) and DCD (pin 7) leads.
A front panel LED (RCV DATA) indicates data activity at the
RCV output.
The output (XMT) from the subassembly is picked off at pins
3 and 5 on connector P5. A gated pulse, created through a series
of integrated circuits, feeds a network that produces bi-polar
(±7 volts at 10 mA) or EIA Standard RS-232 (± 12 volts at
20 mA) signals. These outputs are dependent upon the subas-
sembly strap options selected. The host module connects to this
section of the circuit at the TXD (pin 10) and RTS (pin 12) leads.
A front panel LED (XMT DATA) indicates data activity at the
XMT output (pin P5-5).
49009-0398 <90-00090>
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