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Signal
Pin
Return
Pin Signal Direction Description
17 - CHASSIS
GND
- Printer’s chassis ground,
which is connected to the
logic ground.
18 - NC - Not used
19-30 - GND - Twisted-pair return signal
ground level
31 16
INIT IN When this signal goes LOW,
the printer controller is reset
to its state when the power is
first turned on and the print
buffer is cleared. This level is
normally HIGH; its pulse width
must be more than 50
µ
s at
the receiving terminal.
32 -
ERROR OUT This signal level goes LOW
when the printer:
1) Is out of paper
2) Is in an error state
3) Has no ink cartridges
installed
33 - GND - Same as for Pins 19-30
34 - NC - Not used
35 - +5 V OUT Pulled up to +5 V through
1 K
Ω
resistance
36 - NC - Not used
Note:
❑
The column heading “Direction” refers to the direction of signal flow as
viewed from the printer.
❑
“Return” denotes the twisted-pair return to be connected at signal ground
level. For the interface wiring, be sure to use a twisted-pair cable for each
signal and to complete the connection on the return side.
❑
All interface conditions are based on TTL level. Both the rise and fall times of
each signal must be less than 0.2 microseconds.
❑
Data transfer must be carried out by observing the ACKNLG or BUSY
signal. Data transfer to this printer can be carried out only after receipt of
the
ACKNLG signal or when the level of the BUSY signal is LOW.
Specifications
A-11