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6-4
Parallel Interface Specifications
6-4-1
Specifications
ITEM
SPECIFICATION
Data Transfer Rate
1,000
~
6,000 characters per second
Synchronization System
By strobe pulses supplied externally
Handshake
By ACK and BUSY signals (Refer to Fig. 6-4.)
Logic Level
Compatible with TTL level (Refer to Fig. 6-5)
Connector Signals
Refer to section 6-4-2
ACK
DATA
BUSY
I
r--Approx.
I
I
i-.jtr-
ITU
----r:-t-
~
__________
~Ir---------
T: More than 0.5wsec.
Fig. 6-4
Data Transfer Timing Chart
Signal Name
Circuit Example
DATA 1 - DATA
8
(To Printer)
4.7k,'
~~
~'
4.7krl
STROBE
100(2
(To Printer)
470pF
J;
-
~.
BUSY, ACK
4.7krl
(From Printer)
Fig. 6-5
Circuit Example of Parallel Interface
-63-
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