P
AGE
10
44214-0898 <90-00005>
A
pplications for the 44214 9600 bps Modem consist of digital
data transmission service between distant equipment sites.
Use the 44214 with equipment from other manufacturers (for
example, alarm and control) to transmit and receive data be-
tween a remote location and central location.
Fig. 5 shows a 44214 Modem application. A 44214 Modem at a
remote location transmits 460 Alarm and Control System data to
a 44214 Modem at a central data processing location. The 44214
Modem provides stable operation because its battery, a DC
power source, is free of AC power interruptions.
Fig. 6 shows a 44214 Modem used in the 05547 DTSS3A
Orderwire\Data Interface. In this application the 44214 pro-
vides a 9600 bps interface between a piece of Data Termination
Equipment and Dantel’s DTSS3A Orderwire. The 05547 then
provides two-way voice and/or data communication over a
64-Kilobit Channel. At the far end is another 05547 equipped
with another 44214 9600 bps Modem.
OPERATION
F
or the most part, once the switches, straps, and levels have
been set, operation of the 44214 9600 bps Modem consists of
observing the front panel LEDs.
Six green LEDs on the 44214 front panel indicate:
♦
TD (Transmit Data)
♦
RD (Receive Data)
♦
RTS (Request To Send)
♦
CD (Carrier Detect)
♦
DTR (Data Terminal Ready)
♦
CTS (Clear To Send)
There are two recessed switches labeled ALB-ON/OFF and
DLB-ON/OFF. These switches test the modem’s operation.
There is one recessed switch labeled ORG-ANS. This switch sets
the mode of operation for the modem.
Two normal-through mini jacks, labeled 4W LINE (transmit
line) and 2W LINE (receive line), provide facility connection.
Two jacks, labeled 4W MON (transmit monitor jack) and
2W MON (receive monitor jack), monitor facility-side transmit
and receive.
The RCV level potentiometer adjusts the modem IC receive
level. The XMT LEVEL potentiometer sets the transmit level at
the XMT LINE jacks.
LINE
MON
LINE
MON
TD
RD
RTS
CD
DTR
CTS
2W
XMT
4W
XMT
RCV
LEVEL
GND
ON
OFF
ON
OFF
ORG
ANS
RCV
RST
ALB
DLB
44214-00 REV__
44214-00
9600 BPS MODEM
APPLICATION INFORMATION
I
MPORTANT
N
OTE
:
When used in alarm applications,
as depicted in Fig. 5, the 44214
has specific limitations.
The 44214 may only be used at
9600 baud.
The 44214 modem may only be
used on point-to-point (not
bridged) circuits.
The 44214 modem may only be
used with one other 44214 mo-
dem operating at 9600 baud.
