Serial Commands; Serial Communications; Rs-232 Connection And Port Configuration; Command And Response Format - Legamaster ETX Serie Manual Del Usuario

SERIAL COMMANDS

10. SERIAL COMMANDS

10.1. SERIAL COMMUNICATIONS

The display uses a simple text-based control protocol to take requests from control devices and to provide
responses to such devices. This section describes how to send control messages over a serial link between the
display and an automation/control system or a PC running a terminal emulation program such as Windows
HyperTerminal or Tera Term.

10.2. RS-232 CONNECTION AND PORT CONFIGURATION

Connect your control system or PC to the RS-232 input of the display.
Configure the RS-232 controller or PC serial port as follows: Baud rate: 115200, 8bit, non parity, 1 stop bit.

10.3. COMMAND AND RESPONSE FORMAT

RS232 Command format:
NAME: START
EX:
A9
- The Device ID Can be set in the ‚lock' menu of
the screen.
- If ID 00 is used in the command, it is seen as
a ‚broadcast' command (Screens will always
accepted the command)
RS232 return from screen
The screen will return an acknowledgment or a
non-acknowledgement in the following format:
NAME: START
BYTE: 1byte
EX:
A9
20
ETX-SERIES – USER MANUAL – ENGLISH
COMMAND ID VALUE
11 00 01
ACK COMMAND ID VALUE
1byte 1byte 1byte 1byte
xx 11 00 ERR
where:
- Command accepted:
will be same as the sent Value.
END
- Command not Accepted: xx= 4E, the ‚value' (Err) will
8A
show as follows:
- 01 = Invalid command
- 02 = Invalid data value
- FF = Unknown error
END
1 byte
8A
®
xx= 41, the returned ‚value'