Appendix 6 Universal Serial Communications App6-29
Response Time and BUSY
Response time varies depending on the type of command.
• RM / RI / RC
These commands immediately send a response once receipt of data is complete.
No NAK [01] (BUSY) signal is given.
• WM / TR / WI / WC
Once receipt of data is complete, these commands first check the display status. If the display
status is found to be complete, a response is sent and a command is executed.
If the status is BUSY and the display is completed within the time set in [Busy Time], a response is
sent.
If the display is not completed within the specified time, an NAK [01] (BUSY) signal is sent. In this
case, it is necessary to retransmit the command.
When [Busy Time] is set as [0], the machine waits until the display is complete, and then a
response is transmitted after a command is executed.
Command
• Command
Available commands are shown below.
T
Host side
(command)
V series
(Response)
T = 10 msec or less
T
Host side
(command)
V series
(Response)
T = [Busy Time] + 10 msec or less
Signal Name Name Contents
RM Read Read data memory
WM Write Write data memory
TR Retry Retry when NAK [01] is BUSY
WI Interrupt Setting Allow interrupt (Connection mode 1 : 1)
RI Read Interrupt Status Read interrupt setting status (Connection mode 1 : 1)
RC Read CHR Read data memory as characters
WC Write CHR Write data memory as characters
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