APPENDIX J
Appendix J
Pinout Chart
The MX-70 includes a parallel interface as the standard equipment, and this
paragraph describes the parallel interface.
(1) Specifications
(a) Data transfer rate: 1000 CPS (max.)
(b) Synchronization:
By externally supplied STROBE pulses.
(cl Handshaking:
By ACKNLG or BUSY signals.
(d) Logic level:
Input data and all interface control signals are
compatible with the TTL level.
(2) Connector
Plug: 57-30360 (AMPHENOL)
It is recommended that interface cables be kept as short as possible
(3) Connector pin assignment and descriptions of signals
Connector pin assignment and descriptions of respective interface signals
are provided in Table 7.
Table 7 Connector Pin Assignment and Descriptions of Interface Signals
Signal
Return
Pin No.
Pin No.
Signal Direction
1
19
STORAGE
In
2
20
DATA 1
In
3
21
DATA 2
In
4 22 DATA 3
In
5
23 DATA 4
In
6 24 DATA 5
In
7
25 DATA 6
In
8 26 DATA 7
In
9
27 DATA 8
In
10
28 ACKNLG
out
Description
STROBE pulse to read data In Pulse width
must be more than 0.5µs at receiving
terminal The signal level IS normally
“HIGH”. read-In of data IS performed at
the transit to “LOW” level of thus signal
These signals represent information of the
1st to 8th bits of parallel data respectively
Each signal IS at “HIGH” level when data
IS logical “1” and “LOW” when logical
“0”
The logical state of each data must be
held as IS until the BUSY signal comes
“LOW” level again.
Approx 5µs pulse “LOW” Indicates that
data has been received and that the
printer IS ready to accept other data
A “HIGH” signal indicates that the printer
cannot receive data The signal becomes
“HIGH” in the following cases’
1 During data entry.
2 During printing operation.
3 During paper feed
4 During printer error status
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