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Section 4 - DRL2E Digital Receiver Line Card
The DRL2E acts as an interface between the digital alarm
transmitter and the CPM2. Different communication for-
mats can be used to transmit the information.
The main functions of the line cards are to continuously
monitor the telephone line, receive calls from digital dialers
or control panels, and to report alarms to the CPM2. In
addition, each line is capable of functioning independently
when communication is lost between the line card and the
CPM2. Each line card can record 256 different alarm mes-
sages and 255 Caller-ID telephone numbers.
4.1
General information
The receiver is capable of processing signals from dig-
ital communicators in a variety of formats. The type of
signal (alarm, trouble, restore, cancel and so on) can
be printed.
4.2
DRL2E Features
• Operator selection of communication formats and
handshake priority
• 64 profiles per line, up to 30 lines.
• Flash Download for software upgrades.
• Records up to 256 messages.
• Records up to 256 Caller ID phone numbers. This
feature helps to locate and identify the source of
the device in communication and assists in trouble-
shooting.
• Multiple alarms are forwarded to the computer and
printer through the CPM2 with minimum delay
• The DRL2E monitors the telephone line connec-
tion, and line faults will result in reports to the
computer and the printer
• DRL2E automatically goes into standalone mode in
case of CPM2 failure
• “Watchdog” timer continually monitors receiver
operation
• “Cold boot” option allows receiver’s configuration
to be reset to factory default programming
• DSP processing to reduce data receiving errors,
and to help for weak and noisy signals
• Gain boost available to amplify weak signals
• Serial link for troubleshooting and easy software
upgrade
4.3
DRL2E Controls
Figure 7, DRL2E Faceplate
Each DRL2E Module features 2 line cards. The LEDs
and push buttons on the left side and the upper LCD
are for Line Card 1. The LEDs and push buttons on the
right side and the lower LCD are for Line Card 2.
Momentarily depressing and releasing a button will
register as a single input or keystroke. Pressing and
holding a button for approximately 1 second will reg-
ister as a repeating input or keystroke. For example, to
quickly scroll through a list of items, you press and
hold the appropriate button, rather than pressing the
button repeatedly.
4.3.1 LCD (Liquid Crystal Display)
Displays incoming data, programming and other infor-
mation. The display is backlit for visibility in low light
environments.
4.3.2 Audio
The “Audio” light comes ON when the receiver is in
Audio mode. When ON, “listen-in” or “2-Way Audio”
is in use. The “Audio” light will automatically turn OFF
at the end of the timed period or when the [CANCEL]
button is pressed.
4.3.3 Line Fault
The “Line Fault” light will come ON if the telephone
line is disconnected. The “Line Fault” light will turn OFF
automatically when the telephone line is restored.
4.3.4 Message Error
The “Message Error” light will come ON when faulty
data is received (for example, if the round pair does
not match, or if the checksum is incorrect). Press the
[ACK] button to acknowledge the error; the “Message
Error” light will be shut OFF.
4.3.5 [ACK/FUNCTION] Button
Press this button to acknowledge an alarm in emer-
gency manual mode. In the normal mode, press this
button to access the line card menu.
4.3.6 Alarm
The “Alarm” light is located inside the [ACK/FUNC-
TION] button. The “Alarm” light will flash if an alarm is
received. The “Alarm” light will be shut OFF when the
alarm is successfully communicated to the CPM2, or
when the operator acknowledges the alarm by press-
ing the [ACK/FUNCTION] button.
4.3.7 Cancel Select
While on-line, press this button to drop the line. In nor-
mal mode, press this button to select the current item.
4.3.8 Watchdog
The "Watchdog" light will FLASH once every 4 seconds
to indicate that line card operation is being monitored.
Summary of Contents for MLR2E
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