3. SETTING FOR COMMUNICATION
IM9000F02-E2
19
3.9 Cautions for communication
Send/receive selection
z
When host computer is selected from data sending to data receiving
When switching the host computer into reception from transmission, it must be confirmed that
the data was surely put on line. This is not observe the transmission buffer of host computer
itself, but confirming with shift register.
Next, the REX-F9000 side secures the maximum time until the transmission line changes to the
data receiving side (until the REX-F9000 is ready to send data) after the host computer has
received the stop bit corresponding to the final character. This maximum time corresponds to
interval time. If no interval time is set, the REX-F9000 side may be set to the send state even
when the host computer side is not set to the receive state. As a result, no communication is
conducted correctly. In addition, set the interval time so as to match the host computer.
z
When host computer is selected from data receiving to data sending
Polling procedure "Response wait time after BCC send" or selecting procedure "Response wait
time after [ACK] or [NAK] send" is processing time required during REX-F9000 data sending.
Therefore, select the host computer from receiving to sending after the lapse of the above time.
As for the necessary processing time, refer to the table of page 21.
