Epson EU-m30 Series, Руководство разработчика

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(1) If Memory switch 5-2 is OFF:
The printer status becomes "buffer full" from when the remaining space in the receive buffer drops to 128
bytes until such time that the remaining space in the receive buffer increases to 256 bytes.
(2) If Memory switch 5-2 is ON:
The printer status becomes "buffer full" from when the remaining space in the receive buffer drops to 128
bytes until such time that the remaining space in the receive buffer increases to 138 bytes.
2) When the receive buffer capacity is specified as 45 bytes (Memory switch 1-2 is ON):
The printer status becomes "buffer full" from when the remaining space in the receive buffer drops to 16 bytes
until such time that the remaining space in the receive buffer increases to 26 bytes regardless of the Memory
switch 5-2 status.

The printer ignores the data received when the remaining space in the receive buffer is 0 byte.
(5) XON/XOFF transmission timing
When XON/XOFF control is selected, the printer transmits an XON or XOFF signal at the timing shown below.
The transmission timing differs depending on the Memory switch 1-3 setting.
Printer status
Memory switch 1-3
status
ON
OFF
XON
transmission
(9) First time the printer goes online after turning the power on
(10) When the receive buffer full status is cleared
(11) When the printer status changes from offline to online
(12) When the printer recovers from a recoverable error by use of
a command
Transmit
Transmit
––
–– Transmit
Transmit
Transmit
Transmit
XOFF
transmission
(13) When the receive buffer becomes full
(14) When the printer status changes from online to offline
Transmit
–– Transmit
Transmit
Notes:

The XON code is <11>H and the XOFF code is <13>H.

XON is not transmitted when the receive buffer is full even in case (3) above.

XOFF is not transmitted when the receive buffer is full even in case (6) above.
(6) RS-232 connection example
Host computer side Printer side
TXD ------------------------------------ RXD
DSR ------------------------------------ DTR
CTS ------------------------------------ RTS
RXD ------------------------------------ TXD
DTR ------------------------------------ DSR
F.G. ------------------------------------ F.G.
S.G. ------------------------------------ S.G.
Notes:

Be careful that the status is not handshaking if connected to a DCE (data is discharged). (DCE: Data Circuit
Terminating Equipment)

Transmit data to this printer after turning on the power and initializing the printer.
(7) Notes on setting Memory switch 1-3 to ON
1) Print operation stops but the status does not become busy when an error has occurred, the cover is open,
printing stops due to a paper-end, or paper is fed by using the Feed switch.