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RTU-292C Operations Manual
4-1
4
Remote Control Protocol
4.1
GENERAL
Included in this section are instructions for controlling the RTU-292C via its RS-232 serial
communications port. The protocol listed in this section is the standard command set that
accompanies the standard software version. If an RTU-292C is shipped with custom software
that employs different commands, a set of special version notes, including a modified protocol,
will be shipped with the unit.
4.2
RS-232 REMOTE CONTROL OVERVIEW
The RTU-292C may be controlled and monitored remotely via its RS-232 interface. The RS-232
interface consists of RX, TX and Ground only. Hardware and software handshaking are not used.
The serial format is 8 data bits, 1 stop bit, and no parity
. The baud rate is controlled by
setting DIP switches on the CPU card. Available baud rates are 300, 1200, 2400 and 9600.
All commands to the RTU-292C and responses sent from the RTU-292C use standard ASCII
characters. All remote commands are terminated with a carriage return (CR) and (optionally) a
line feed (LF). Status information returned from the RTU-292C will always be preceded by a
"%" character, and is also terminated by a CR. This protocol allows control and monitoring of
the RTU-292C via a dumb terminal or a computer program. The commands issued to the RTU-
292C are not case sensitive.
4.3
COMMANDS SENT TO THE RTU-292C
The following section describes the operation of each of the RTU-292C remote control
commands. All commands have the format:
cmd <data> <data> ... <data> <CR>
The first string is the
command
string. The command string must not be preceded by any space
characters. There is at least one blank (space) character after the command string. Any data that
is required by the command follows next. Multiple data sections are delimited by at least one
space. Most commands require that data be presented in a specific order. Finally, the command
is terminated by a Carriage Return character (CR). Line feed characters may be included after
the Carriage Return, but they are not necessary.
Содержание RTU-292C
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