Citizen PROjet II (260-2957) Pinouts Faxback Doc. # 14711
Parallel Interface Pinouts
The parallel interface cable must be a standard shielded, twisted pair
cable, with the connector and shield connected.
Compatibility: CENTRONICS
Circuit logics: TTL
Data format: 8 bits
Logic voltage levels: TTL-compatible
Connector: Amphenol 36 pins (female)
The following diagram illustrates the pins and corresponding signals on
the parallel interface connector.
STROBE 01 > 19 GROUND
DATA 0 02 > 20 GROUND
DATA 1 03 > 21 GROUND
DATA 2 04 > 22 GROUND
DATA 3 05 > 23 GROUND
DATA 4 06 > 24 GROUND
DATA 5 07 > 25 GROUND
DATA 6 08 > 26 GROUND
DATA 7 09 > 27 GROUND
ACKNOWLEDGE 10 < 28 GROUND
BUSY 11 < 29 GROUND
PAPER EMPTY 12 < 30 GROUND
NC 13 < 31 INIT.
NC 14 > 32 ERROR
NC 15 - 33 LOGIC GROUND
LOGIC GROUND 16 34 NC
FRAME GROUND 17 - 35 +5 v (PULL-UP, 3.3K ohm)
+5 v (PULL-UP, 3.3k ohm) 18< 36 nc
Connecor Pins and Corresponding Signals
The following table contains the signals exchanged by the printer and
computer, and their meanings.
PIN SIGNAL SIGNAL DESCRIPTION
DIRECTION
1 to printer STROBE
Signal valid at logic level 0,
used to transfer data to the
printer.
Pulse duration must be at least
0.5micros.
2-9 to printer DATA 0-7
These 8 lines carry the data
transmitted to the printer.
Signal duration must be stable
at least 0.5micros before the
falling edge of STROBE signal,
and remain stable at least
0.5micros after its rising
edge.
Data 7 is the most significant bit but is not used in 7-bit ASCII mode.
10 from printer ACK
Normally at 1; set at 0 to
indicate that the printer has
accepted the single character
transmitted.
11 from printer BUSY
Normally at 0; logic level 1
indicates that the printer
cannot accept any characters,
and is activated in the
following cases: during data
transfer, buffer full, error
condition.
12 from printer PAPER EMPTY
Normally at 0; set at 1 if there
is no paper.
This signal is asynchronous with
respect to Strobe, Busy and
ACK.
13 from printer ON LINE
Not used.
14 to printer AUTOFEED XT
Not used.
16 --- LOGIC GROUND
Logic ground level (0 V).
17 --- FRAME GROUND
(Printer earthed through host).
18 from printer +5 V (PULL-UP)
Supplied across a 3.3 Kohm
resistor.
19-30 --- SIGNAL GROUND
Twisted pair return lines.
31 to printer INIT.
A level 0 pulse of width greater
than 10micros (sent by host)
resets the printer and clears
the print buffer.
32 from printer ERROR
Normally at 1; set at 0 for
anomalies such as paper out,
printer off line, printer fault
condition.
33 --- LOGIC GROUND
Logic ground level (0 V).
35 from printer +5 (PULL-UP)
Supplied across a 3.3 Kohm
resistor.
36 to printer SELECT-IN
Not used.
(LB/all-04/21/95)