Citizen CL-S6621 - Page 78

Interface
CL-S6621 2-64
[While receiving PRIME signal]
Note: If the PRIME signal width is 10 µsec or less, it is not accepted.
BUSY goes to “High” when the PRIME signal is accepted by the printer.
[Timing relationship between BUSY and ACK]
BUSY
PRIME
SELECT
10~15µsec or more
Ack
Fault
About 2 µsec
BUSY
ACK
Center