User manual

Automation Protocol Data Link Layer
Miranda Technologies Ltd Page 25
Data Link Layer
Serial Data Layout
1 start bit, 8 data bits, 1 stop bit. No parity bit.
Data Transfer Rate
Baud rates of 9600, 19200, 38400, 57600, 115200 can be selected for any
RS232 or RS422 serial port.
For some much older units, the data rate for communication is 19200 baud
irrespective of interface standard. Please refer to individual User Manuals for
details.
Coded Binary
Data
Apart from the CRC, ACK, NAK and STX characters, all Oxtel Protocol
characters are in the range of printable ASCII. (>= 0x20).
Control Codes
The control codes used are defined in the following table.
Code Value
STX0 0x2
STX1 0x3
ACK0 0x4
ACK1 0x5
STX2 0x6
NAK 0x7
Note: The names for these codes do NOT correspond to ASCII code
naming conventions.