Robofon 8 Format
Robofon 8 format
send data in a pulsed frequency format in the following protocol:
First bit Last
Bit
Tone = 0, No tone = 1
Freq = 1000Hz
±
5Hz
First Byte
Last Byte
50 baud (20ms / bit)
200ms / char, 11 chars / message
(‘U’ = 55h and ETX = 03h)
Physical format
•
1000 Hz +/- 5Hz pulsed signaling
•
Tone = logical 0
•
Silence = logical 1
•
Speed is 50 baud, 20ms/bit, 200ms/character
Logical format
•
Byte format is 7 bit data, odd parity.
•
Code is always eight (8) digits, ASCII-characters 30h – 39h.
•
The report format is as follows:
SSSSSS XX
where:
SSSSSS is the 6-digit account number
XX is the 2-digit report code (as in 4+2 format)
Signal flow
Receiving equipment
Dialing equipment
Send start char ‘w’ (77h)
Send message described above
Acknowledge ACK (06h)
(Delay greater than 500ms)
Send new start char ‘w’ (77h)
Send next message if available
Acknowledge ACK (06h)
…etc
•
Dialer should start sending the message no more than 200ms after start char.
•
If no response is detected the receiver retries sending start char three times (in total four)
before hanging up.
•
If the receiver reads a message with checksum error it will reply with NAK (15h), wait
more than 500ms and then send a new start char (w).
•
The receiver can optionally send a command back to the dialer after ACK.
The command may be one byte with any content except ‘w’ (77h), ACK (06h) or NAK (15h).
.
0 B0 B1 B2 B3 B4 B5 B6 Par 1
‘U’ N1 N2 N3 N4 N5 N6 N7 N8 ETX chk
6-3
Summary of Contents for ADEMCO VISTA-48A
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