Installation and Setup Guide
6-4
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
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