CITIZEN CL-S521 - Manual (Page 54)

Appendixes
54
Interfaces
Compatible timing specification
[When power is on] (Time it goes off-line)
[While receiving data]
Note: Busy rises when *Strobe signal starts, and data is latched with *Strobe
signal starts.
Data0-7
*Strobe
BUSY
0.5 µ s 0.5 µ s 0.5 µ s
Reset
BUSY
*ACK
SELECT
PowerOn
Error Change in the status of a signal line in
compatible mode
Paper end Busy : L H
PError : L H
Select : H L
nFault : H L
Error other than paper end Busy : L H
• Head open PError : L unchanged
• Other Select : H L
nFault : H L
Conditions for Busy • Receive buffer full
• Data being read
• Error
Parallel port status signals when an error occurs
The status of a signal line will not be changed in bi-directional mode such as
nibble or ECP mode.