Setup guide

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