Installation manual

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4.0 Communications in Progress

4.1 Data Reception

During data reception, a message similar to this will be

displayed:

In CommunicationIn Communication

In Communication

1234 561234 56

1234 56

The DRL2A decodes all information received and stores

the information in its Event Buffer. When a valid signal is

received, the DRL2A sends a kissoff signal and transmits

the decoded alarm signal to the computer and then to the

printer through the CPM2.

Option [3C] may be enabled to allow the DRL2A to

compensate for noisy telephone lines (refer to “DRL2A Line

Card Options Programming” for information on programming

this Option).

The DRL2A will send each message it receives to the printer

for review by the system operator. Two messages may be

sent to the printer to indicate reception problems: the “Fault

Data” and “Fault Call”.

Fault Data Message

When this problem is encountered, the following information

is transmitted to the printer and the computer:

Printer: L0X???????10 Fault Data *

Computer: 0000 T 10

This output for account code "0000” indicates that data

has been received, but is not valid (for example, there are

unmatched rounds or the wrong parity). The following is an

example of faulty data received by the DRL2A, and the

printer output generated:

RoundRound

Round

Data ReceivedData Received

Data Received

Printer OutputPrinter Output

Printer Output

1st 123456 [No printout]

2nd 123446 ?1234?56 Fault Data

?1234?46 Fault Data

3rd 123356 ?1233?56 Fault Data

4th 123456 ?1234?56 Fault Data

5th 123346 ?1233?46 Fault Data

?????10 Fault Data

Fault Call

When this problem is encountered, the following information

is transmitted to the printer and the computer:

Printer: L0X???????40 Fault Call *

Computer: 0000 T 40

This output indicates that a call was received, but no data

was detected. The call may have been a wrong number, or

the calling control panel was unable to connect with the

receiver’s handshakes.

4.2 Stopping Data Reception Manually

To cancel communications between the DRL2A Line Card

and the calling control panel, press the [CANCEL] button.

Pressing the [CANCEL] button will hang up the line. This

feature may be used to hang up on a control panel that is

repeatedly sending alarms.

4.3 2-Way Audio Mode / SG-MLR2-DG Receiver

Connections

The DRL2A features two telephone line outputs. The

connections are labelled HNDSET1 for the Left Line Card,

HNDSET2 for the Right Line Card. These terminals allow a

touch-tone telephone to be connected to the DRL2A for

voice communication over the same telephone line after digital

data has been received. This feature is especially useful for

medical signalling installations and vocal alarm verifications.

IMPORTANT NOTE:IMPORTANT NOTE:

IMPORTANT NOTE: If a regular touch-tone telephone is

used for 2-Way audio communication, the phone must be

left in the

off-hookoff-hook

off-hook

position. If the phone is not kept in the

off-hook position, the DRL2A will switch to an open line,

causing the line to be dropped (hang up).

If used with a PBX system, 2-Way audio communication

needs bridging resistors. Measure the handset phone

impedance and use a resistor of the same value. A typical

value is 220W.

If the impedance is incorrect, the handset terminal switchover

will behave as if switching to an on-hook phone, and the

line will be dropped.

Audio Communication Methods

Two methods are available for using the 2-Way Audio Mode:

Alarm type code Method

After the digital alarm data has been received and the

receiver has transmitted the last kissoff, the receiver

compares the alarm type codes in 3/1, 3/2, 4/1, 4/2, 4/3,

10-40 BD or DTMF touch-tone formats to the value

programmed in Option [4C]. This is done to determine if

the 2-Way Audio Mode should be activated. This feature is

designed for use with medical signalling systems in areas

where privacy regulations apply.

This method of activation is recommended as it can

distinguish between different types of alarms from the same

panel, and activate the 2-Way Audio Mode only when

needed. Note that Options [49] and [4C] must be

programmed to use this method (see Alarm Zone Method

below).

Reserved Account Code Range Method

The first digit of the Account Code will determine if the 2-

Way Audio Mode is to be activated.

This method is used by some alarm panels and medical

signalling systems. The central station manager can group

these panels into a range of account codes in order to

switch on the 2-Way Audio Mode. The transmission of an

Account Code from any of these panels will trigger the

DRL2A’s 2-Way Audio Mode. Note that Options [49], [4A]

or [4B] must be programmed to use this method.

A combination of all methods may also be used, please

refer to p.18.

Example

Reserve a block of account codes, such as 800-

9FF (for 3-digit formats) or 7000 - 8FFF ( for 4-digit formats)

for panels which can communicate in 2-Way Audio.

Note: The DRL2A can switch in 2-Way when it receives the

proper audio code with the following formats: SIA or FSK

200baud.