User`s manual

3.2
Serial Interface Protocol
SERIAL COMMUNICATIONS PROTOCOL
The camera uses a full duplex UART type asynchronous system, using standard
nonreturn-to-zero (NRZ) format (one start bit, eight data bits, one stop bit, no
parity). The baud rate is fixed at 9600. The character code is based on the
ASCII standard.
The character flow control protocol is XON/XOFF. XON is assigned DC1
(control-Q) and XOFF is assigned DC3 (control-S). The receiver sends the
XOFF character when it wants the sender to pause in sending data and an XON
character when it wants the sender to resume.
The camera will recognize a command as three command characters, followed by
a space character, followed by an argument that consists of one or more charac-
ters, ended by the carriage return and line feed characters. The camera responds
to a valid command with a carriage return and line feed (CR-LF)
The camera will recognize a query as three command characters followed by the
question mark character, then ended by the carriage return character.
The camera responds to a query with three command characters, followed by a
space bar character, followed by an argument that consists of one or more
characters, then ended by carriage return and line feed (CR-LF).
ERROR MESSAGES
The camera can respond to an erroneous command or query in one of four
possible ways.
Message from camera Explanation
ERROR-SYNTAX The camera cannot make sense of the command.
ERROR-ARG RANGE The command is recognized but the argument is out
of range or indecipherable.
ERROR-TRANSMISSION The receiver detected a transmission error such as
buffer overflow, parity, or framing.
ERROR-MULTIDROP The command was recognized but conflicts with
CONFIGURATION current multidrop settings
NOTE
In the following text the command and argument that are sent to the camera are
in bold type. The carriage return and line feed at the end of each command are
not shown as they are required in every instance.