Racal Instruments 9916 - Page 84

18. An altemative to para 17, particularly when fast cycle times are desired, is to
connect the Hold signal to the Hold/Reset input. If this is done, a stretched
version must additionally be applied to the print Hold input (pin 49). The Hold signal should
De at least as long as the correction process, and the signal applied to the Print Hold input
should be approximately 20~s longer than that applied to the Hold/Reset input. This is to
prevent the interface responding to the end of gate time produced by the reset. For cases
where the correction time is short (less than the Print Comr:nand pulse width) this may be
implemented by linking the Print Command output (pin 48) to the Hold/Reset input (pin 24)
and by applying a stretched version of the Print Command to the Print Command to the
Print Hold input (pin 49). In this way cycle times as short as 'Gate Time + 5ms' can be
achieved. This is illustrated in Fig. A4.
GATE TIME
~-- SHORTENED ~-----'
GATE TIME
NEXT CORRECT
GATE TIME
DATA UPOATE ---'·===~~_lm_-_5z flL- -----;----' ------.Jn
_
__________ -l9
PRINT CCf-iMANO Iv :;,," J 1'---_-+---:- _
CORRECTION TIME
HOLDIRESET
liP
PRINT HOLD lIP
I
Flg.A4
Section 4 ; 99 serie's Appendix 1.
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