4-2SectionOutline of Communications
374
Command Transmission Intervals
• If commands are sent too frequently, processing at the PT will not be able to
keep pace with them and a communication error (buffer overflow) will occur.
• Use the flow control to prevent a buffer overflow.
Order of Priority of Input Communication Commands
When a reason for input notification arises during processing of a command
from the host, the input command is issued only after the ongoing command pro-
cessing has been completed.
Checksum
The checksum of the command response is the 2 digits ASCII code that is indi-
cated using lower one-byte of the total sum (in unit of bytes) of the following, from
the [ESC] code at the beginning to the character immediately before the check-
sum value. It can be omitted by specifying the parameter used to omit sum value.
If ON is set for the Comm. Auto-return memory switch, communication errors are
not displayed on the screen even if they occurs. However, in case of time out
error at the PT side, an error message is displayed on the screen and the opera-
tion is stopped.
Reference: Whether or not the error response is returned depends on the memory switch
setting made for Comm. Auto-return and error type.
For details, refer to Error Response in page 396.
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