Epson TM-U950 Technical Manual page 37

CONFIDENTIAL
Switching between on-line and off-line
The TM-U950P printer does not have an on-line/off-line button. The printer goes off-line in the
following conditions:
Between the time when the power is turned on (including reset using the interface) and
when the printer is ready to receive data.
During the self-test.
When the cover is open.
During paper feeding using the paper feed button.
When the printer stops printing due to a paper-end (when the paper-end sensor detects a
paper end or when the paper near-end sensor is enabled by ESC c 4 and detects a paper-
end).
During the macro execution standby state. (The macro is executed by pressing the paper
feed button.)
When an error has occurred.
Notes on setting DIP switch 2-5 to ON
The printer mechanism stops but does not become busy when an error has occurred, the cover is
open, printing stops due to a paper end, or paper is fed using the PAPER FEED button.
When setting DIP switch 2-5 to ON to enable handshaking with the printer, be sure to check the
printer status using the GS a command and the ASB function. In this setting, the default value
of n for GS a is 2. The printer automatically transmits the printer status, depending on on-line/
off-line changes.
When using DLE EOT, DLE ENQ and GS ENQ, be sure that the receive buffer does not become
full.
When using a host that cannot transmit data when the printer is busy and if an error occurs,
DLE EOT, DLE ENQ and GS ENQ cannot be used when the printer is busy due to a receive
buffer-full state.
When using a host that can transmit data when the printer is busy and the receive buffer
becomes full while transmitting bit-image data, a DLE EOT, DLE ENQ or GS ENQ used
while sending bit-image data is processed as bit-image data, not as acommand. Secondly,
any data transmitted when the receive buffer is full may be lost. Thirdly, data sent during
data entry or data sent when the printer is busy may be lost regardless of the DIP switch
setting.
Example: Check the printer status using ESC v or ESC u after transmitting each line of data
and use the 2K byte receive buffer. Transmit one line of data so that the receive buffer does
not become full.
1-26 Features and General Specifications Rev. A