Omron NT20S-ST121B-EV3 User Manual page 236

RS-232C Communications
Interval between
Transmitted Commands
Controlling PT Status with
Operating Commands
Coordinate Specification
with the Terminal
Commands
Error Display
As a small number of bytes is transmitted by the Host, the interval between
transmissions should not exceed 5 seconds if a command is divided up for
transmission. A timeout error occurs if the interval between transmissions
exceeds 5 seconds.
When commands are sent too frequently, a buffer overflow error may occur if
the NT20 cannot keep up with the command processing.
In order to prevent buffer overflow, use flow control.
Control of the NT20 status by the operating commands is restricted by the
NT20 memory switch settings as listed below.
Operating command
Buzzer control command [ESC] T
The entire command is ignored if any point specified at coordinates X, Y with
the Terminal commands lies outside the screen.
If the "automatic reset after communications" memory switch of the NT20 is
set to ON, no message is displayed when a communications error occurs.
However, time-out errors are displayed.
Restriction from memory switch setting
Effective when "buzzer turned on"
Section 6-2
215