Citizen CL-S700DT

Appendixes
54
Interfaces
XON/XOFF Protocol
Requirements to output X-ON code
• Communicationispossiblewhenthepowerison.
• Whenthereceivebuerhaslessthan128bytesavailable,XOFFcodeis
output,thenthereceivebuerhasatleast1024bytesavailable.
Requirements to output the X-OFF code
• Whenthereceivebuerhaslessthan128bytesavailable
16K bytes
XON
XOFF
Receive buer
1024 bytes
128 bytes
DTR Protocol
Conditions when the DTR signal is "Ready (High)"
All the following conditions are satised.
• Thereceivebueris128bytesormoreavailablecapacity.
* Whenthereceivebuerhaslessthan128bytesavailableandtheDTR
signal has changed to BUSY (Low) status, BUSY status is maintained until
thecapacityofthereceivebuerhasreached1024bytesormore.
Conditions when DTR signal is "Busy (Low)"
• Whenthereceivebuerhasfallentolessthan128bytesavailable.