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Section 12 - Automation Protocols
The Sur-Gard MLR2000 receiver sends the various protocols to
report signals to the central station computer via an RS232
port. The complete description of protocols is available upon
request.
12.1 Data Byte protocol
The Sur-Gard MLR2000 receiver uses a default configura-
tion of 9600 Baud, one start bit, 8 data bits, no parity bit,
and one stop bit structure to transmit and receive signals
on the RS-232 port. This protocol can be programmed on
the receiver to enable different configurations.
12.2 Acknowledgment of the Signal
The Sur-Gard receiver requires an acknowledgment signal
[ACK] (Hex 06) from the computer software within 4 sec-
onds for each message sent. Failure to receive the [ACK]
will result in the retransmission of the same signal three
times before giving up. The same thing happens if the
receiver receives a [NAK] (hex 15). In case of communica-
tion failure with the computer, the Sur-Gard receiver can
store up to 127 times the number of lines installed in its
internal memory. The communication is resumed when
the first ACK is received on the heartbeat.
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