Epson TM-T90 Specification page 37

Confidential
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.
XON transmission
XOFF Transmission ➄ When the receive buffer becomes full
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.
EPSON
Table 2.1.2 XON/XOFF Transmission Timing
Printer status
➀ When the printer goes online after turning on the power
(or reset using interface)
➁ When the receive buffer is released from the buffer
full state
➂ When the printer switches from offline to online
➃ When the printer recovers from an error using the
DLE ENQ 1 or DLE ENQ 2 commands
➅ When the printer switches from online to offline
TITLE
TM-T90
Specification
(STANDARD)
Memory switch
Msw 1-3 status
ON
Transmit Transmit
Transmit Transmit
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—
Transmit Transmit
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SHEET NO.
REVISION
NEXT
F
20
OFF
Transmit
Transmit
Transmit
SHEET
19