Yokogawa Touch Screen GP20 - Manual (Page 18)

2-4
IM 04L51B01-17EN
2.1.4 GX/GP Responses
The GX/GP returns the following responses to commands.
• If the GX/GP successfully completes the processing of a received output request
command, it outputs the requested data.
• If the GX/GP successfully completes the processing of a received command that is not an
output request command, it outputs an affirmative response.
• If a command syntax error, setting error, or other error occurs, the GX/GP outputs a
negative response.
For each command the GX/GP receives, it returns a single response. The controller (PC)
side must process commands and responses in accordance with this command-response
rule. If the command-response rule is not followed, the operation of the GX/GP is not
guaranteed. For details on the response syntax, see 2.9 Responses to Commands .
2.1 Command Transmission and GX20 Responses