Specifications

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Section 9 - Automation Protocols
The Sur-Gard MLR2E receiver sends the various protocols to
report signals to the central station computer via an RS-232
port. The complete description of protocols is available
upon request.
9.1 Data Byte protocol
The Sur-Gard MLR2E receiver uses a default configu-
ration of 19200 Baud, one start bit, seven data bits,
one even 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.
9.2 Acknowledgment of the Signal
The Sur-Gard receiver requires an acknowledgment
signal [ACK] (Hex 06) from the computer software
within 4 seconds 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 communication failure with the
computer, the Sur-Gard receiver can store up to 127
times the number of lines installed in its internal mem-
ory. The communication is resumed when the first
ACK is received on the heartbeat.