Specifications

Confidential
EPSON
TITLE SHEET
REVISION
NO.
SHEET NEXT
E
TM-T90
Specification
(STANDARD)
20 19
2.1.1.4 XON/XOFF transmission timing
When XON/XOFF control is selected, the printer transmits XON or XOFF signals as follows.
Transmission timing differs depending on the memory switch setting.
Table 2.1.2 XON/XOFF Transmission Timing
Memory switch
Msw 1-3 status
Printer status ON OFF
XON transmission ➀ When the printer goes online after turning on the power
(or reset using interface)
Transmit Transmit
➁ When the receive buffer is released from the buffer
full state
Transmit Transmit
➂ When the printer switches from offline to online — Transmit
➃ When the printer recovers from an error using the
DLE ENQ 1
or
DLE ENQ 2
commands
— Transmit
XOFF Transmission ➄ When the receive buffer becomes full Transmit Transmit
➅ When the printer switches from online to offline — Transmit
NOTES: • The XON code is <11>H and the XOFF code is <13>H.
• In case ➂, XON is not transmitted when the receive buffer is full.
• In case ➅, XOFF is not transmitted when the receive buffer is full.
• When memory switch Msw 1-3 is set to OFF, XON is not transmitted if the printer is in
offline state in case ➁.
2.1.1.5 Notes on setting the handshake operation with memory switch Msw 1-3
1) 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.
2) When setting the memory switch 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 online/offline changes.
3) When using
DLE EOT, DLE ENQ
, and
DLE DC4
be sure that the receive buffer does not become
full.
• When using a host that cannot transmit data when the printer is busy:
If an error has occurred,
DLE EOT
,
DLE ENQ
, and
DLE DC4
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:
When the receive buffer becomes full while transmitting bit-image data, and
DLE EOT
,
DLE
ENQ
, or
DLE DC4
is used while sending bit-image data, the code is processed as bit-image
data. The data transmitted when the receive buffer is full may be lost.
Example: Check the printer status using
GS r
after transmitting each line of data and use the
4KB receive buffer. Transmit data one line at a time so that the receive buffer
does not become full.