
B-63322EN-1/01 4. PROTOCOL A
-15-
4.3
COMMUNICATION SYSTEM
It is used to perform communication between the remote buffer and
host computer. When the both are ready to operate after power on,
the communication starts from the transmission of remote buffer and
reception of host computer and then the transmission/reception is
repeated.
(1) Approximately two seconds are required for the first request
after both of remote buffer and host computer are ready.
However, when the CS signal is off, the first transmission is
performed after turning on the CS signal.
(2) The minimum time period between bytes is determined by the
parameter Ti (msec) of SET command. There is no prescription
of minimum time period between reception bytes.
(3) Switching from transmission to reception
Immediately the remote buffer side can be ready to receive
signal. Start transmission within the parameter setting time (To
sec) at the host computer side. When no response is obtained for
the time period (To or more), an error occurs in the host
computer. (Overtime)
ER
RS
CS
SD
RD
Approximately 2 seconds
0 < t2 < To n2 < No
Tx<t3<tp
n2t2 t3
t1 > ti
n1 < 3
SD
CS
RS
RD