Epson TM-U950 Technical Manual page 32

CONFIDENTIAL
Table 1-7. Interface Connector Specifications and Functions
Pin number
20
25
Table 1-7a. Pin 20 Information
Printer status
During the interval between
power-on (reset using interface)
and the time when the printer is
ready to receive data.
During the self-test
When the cover is open.
During paper feeding with the
paper feed button.
When the printing has stopped
due to a paper-end.
When an error has occurred.
When the receive buffer becomes
full (*1).
(*1) The "buffer full" condition in this case starts when remaining buffer space falls to 16 bytes or
less and ends when it becomes 26 bytes or more. The printer ignores the data when the
remaining space in the receive buffer is 0 bytes.
Note
Pins 8 - 19 and 21 - 24 are not used.
Rev. A
Signal name I/O Function
1) When DTR/DSR control is selected, this signal indicates whether the
printer is busy. MARK indicates busy and SPACE indicates not busy. The
DTR O
busy condition is changed using DIP switch 5 of the bank 2 as shown in
Table 1-7a.
2) When XON/OFF control is selected, the signal indicates whether the
printer is correctly connected and is ready to receive data. SPACE
indicates "ready". The signal is always SPACE except in the following two
cases:
(o) During the interval between power-on and the time when the printer
is ready to receive data.
(o) During the self-test.
Changing the DIP switch setting enables this signal to be used as a reset
INIT I signal for the printer. The printer is reset when the signal remains SPACE for
1 ms or more.
DIP SW 2-5 status
ON
BUSY
BUSY
—
—
—
—
BUSY
TM-U950/U950P Technical Manual
OFF
BUSY
BUSY
BUSY
BUSY
BUSY
BUSY
BUSY
Features and General Specifications 1-21