AMT Datasouth Accel-7350, Service Manual

Page: 13 / 119

12
Printer Input Signals
DATA1-DATA8 8bit data signals with DATA 1 being the Least Significant Bit (LSB), and DATA 8
being the Most Significant (MSB).
STROBE* A strobe signal for reading 8-bit data. When this signal goes "low", data is read.
The data is latched on the falling edge of STROBE*.
The next STROBE* pulse shall not occur until the trailing edge of the BUSY
signal from the previous data.
INITIAL* A signal for initializing the printer (similar to turning power on). The signal goes
"low" to reset the printer, then when the signal returns "high" the printer will
initialize.
AUTO FEED* This signal is ignored.
SELECT IN* This signal is ignored.
Printer Output Signals
BUSY
A signal indicating that printer is busy. When this signal goes "high", the printer
does not accept data from the host. The printer causes the BUSY signal to go
"high" in the following cases.
(1) When the initializing operation is being executed;
(2) When data is input with the STROBE* signal;
(3) When the self test print is executed;
(4) When the printer is in the offline state;
(5) When the printer cover is opened;
(6) When a paper out condition or other error takes place.
ACK* A signal, which is output in synchronization with the transition of BUSY from
"high" to "low". ACK* indicates the printer is ready to accept the next data byte.
In the cases (4), (5), and (6) above, the ACK* signal is not output.
PE When paper is not loaded, this signal goes "high". When paper is loaded, this
signal goes "low".
ERROR* This signal goes "low" in the following cases;
(1) when the paper out or the paper error takes place;
(2) when one of the function errors takes place;
(3) when the printer cover is opened; or
(4) when the printer is in the offline state
However, this signal stays "high" in the IBM mode when the offline state is
entered from the control panel.
SELECT This signal is always HIGH.