Robofon 8 Format - Honeywell ADEMCO VISTA-48D Installation And Setup Manual

Robofon 8 Format

Robofon 8 format
First bit Last
First Byte Last
'U'
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
Send start char 'w' (77h)
Acknowledge ACK (06h)
(Delay greater than 500ms)
Send new start char 'w' (77h)
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
send data in a pulsed frequency format in the following protocol:
0 B0 B1 B2
Tone = 0, No tone = 1
Freq = 1000Hz ± 5Hz
N1 N2 N3 N4
50 baud (20ms / bit)
200ms / char, 11 chars / message
('U' = 55h and ETX = 03h)
B3 B4 B5 B6
N5 N6 N7
Dialing equipment
Send message described above
Send next message if available
Bit
Par 1
Byte
N8 ETX chk
(15h)..
6-3