CP295MRS CP305MRS CP405MRS
Technical reference - Rev. K
9
Advanced Printing Systems
5.6
Timing for parallel communication
The communication protocol is Centronics compatible, and has the ability to handle the “Compatibility Mode”
(Write from the Host to the Printer), and also the “Byte Mode”, for the host to read internal data from the
printer. The “Byte Mode” is used to receive printer status back from the printer.
5.6.1
Compatibility mode timing (host writes to the printer)
P
ARAMETER
M
IN
T
YP
M
AX
C
OMMENTS
Time STB (tSTB)
5 µs
-
-
This time is given by the host
Time BUSY (tBUSY)
25 µs
90 µs
250 µs
This hold time is controlled by GS b
control code
Time tVALDATA
25 µs
-
-
Time in while the data must be
stable. This time is fixed by the
host.
Time ACK (tACK)
-
3µs
-
IMPORTANT NOTE
:
The data (D0-D7) must be stable for tVALDATA. If not, please contact APS for additional cabling.
D0-D7 (Host Output)
STB (Host Output)
BUSY (Printer Output)
ACK (Printer Output)
DATA VALID
tSTB
tACK
tBUSY
tVALDATA