Confidential
EPSON
TITLE
SHEET
REVISION
NO.
SHEET
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B
RP-U420 series
Specification
(STANDARD)
12
11
2.1.1.4 XON/OFF transmission timing
When XON/OFF control is selected, the printer transmits XON or XOFF signals as follows. Transmit
timing depends on the setting of DIP switch 1-5.
Table 2.1.2 XON/XOFF Transmission Timing
Dip Switch 1-5 Status
Printer Status
ON
OFF
1) When the printer first goes online after power
on or after resetting through the interface.
Transmission
Transmission
2) When the receive buffer is released from the
buffer-full state.
Transmission
Transmission
3) When the printer status changes from offline
to online.
--
Transmission
[XON
transmission]
4) When the printer recovers from an error
through a command.
--
Transmission
5) When the receive buffer is full.
Transmission
Transmission
[XOFF
transmission]
6) When the printer status changes from online
to offline.
--
Transmission
NOTES:
•
The XON code is <11>H and the XOFF code is <13>H.
•
In case 3), XON is not transmitted when the receive buffer is full.
•
In case 6), XOFF is not transmitted when the receive buffer is full.
•
When the DIP SW1-5 is set to Off, XON is not transmitted if the printer is offline state in
case 2).
2.1.1.5 Example serial interface connection
Host
Printer
TXD-------------------------RXD
DSR ------------------------DTR
CTS-------------------------RTS
RXD ------------------------TXD
DTR ------------------------DSR
FG --------------------------FG
SG --------------------------SG
•
When connecting the printer to a DCE (DCE: Data Circuit Terminating Equipment), set the
handshaking so that the transmitted data can be received.
•
Transmit data to the printer after turning on the power and initializing the printer.
