CITIZEN CLP-521 - Manual (Page 48)

Appendixes
48
Error Change in the status of a signal line
Both directions OFF Both directions ON
Paper end Busy : L H Busy : L unchanged
PError : L H PError : L H
Select : H L Select : H unchanged
nFault : H L nFault : H L
Error other than paper end Busy : L H Busy : L unchanged
• Head open PError : L unchanged PError : L unchanged
• Other Select : H L Select : H unchanged
nFault : H L nFault : H L
Conditions for Busy • Receive buffer full • Receive buffer full
• Data being read • Data being read
• Error
Parallel port status signals when an error occurs
Under the specifications for this bi-directional parallel interface, the parallel
port status signals when an error occurs are, as shown below, partially
processed differently than with compatible mode used up till now. When
both are on in the setting menu, even if a printer error has occurred, the
BUSY signal line is not active (“H”).
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
0.5us 0.5us 0.5us
Reset
BUSY
*ACK
SELECT
PowerOn
Interfaces