Confidential
EPSON
TITLE
SHEET
REVISION
NO.
SHEET
NEXT
B
RP-U420 series
Specification
(STANDARD)
14
13
<AC characteristics>
Reset minimum pulse width: TRS 1 ms (minimum)
•
When pin 6 (DSR) is used:
Figure 2.1.1 Interface Reset Signal (Pin 6)
•
When pin 25 (INIT) is used:
Figure 2.1.2 Interface Reset Signal (Pin 25)
NOTES:
1. Correct printer operation is not guaranteed unless the signals meet the above stated
conditions. The above conditions must also be met when TTL signals are used to drive
the DSR and INIT reset pins. Although a signal is input to pin 6 (DSR) at the TTL level,
according to the DC characteristics described above, the operation is not guaranteed and
pin 6 cannot be controlled.
2. When pin 6 (DSR) and Pin 25 (INIT) are open, the printer is operating.
2.1.2 IEEE 1284 Bidirectional Parallel Interface (Parallel Interface Specifications)
Copyright (C) 1993 by the Institute of Electrical and Electronic Engineers, Inc.
2.1.2.1 Specifications
Data transmission:
8-bit Parallel
Synchronization:
Externally supplied nStrobe signals
Handshaking:
nAck and Busy signals
Signal levels:
TTL compatible
Connector:
57RE-40360-830B (DDK) or equivalent (IEEE 1284 Type B)
Reverse communication (Printer Host): Nibble or Byte Mode
NOTE: The letter "n" in front of a signal name indicates active LOW.
