Epson TM-U295 Manual page 120

H.2.4.3 Notes
1) The start of negotiation phase shall be defined with rising edge of 1284-Active signal.
2) The timing to start negotiation in the Compatibility Mode shall be in principle after nAck pulse has
been developed following nStrobe.
After the rising edge of nStrobe, by detecting the rising edge of 1284-Active signal before or during
the output of nAck, the interface enters the negotiation phase. In this case, when the termination
is followed by the Compatibility Mode, nAck pulse is not developed.
3) Negotiation is available from Busy or Error state in the Compatibility Mode. In this case, the
termination fails to lead to the original Busy or Error state but to the printer status after termination.
4) If the printer fails to support the communication mode requested by the host, the host shall enter
the Termination phase then return to the Compatibility Mode. (Refer to H.2.4.2.)
Table H.2.4.1
Bit
7 Request Extensibility Link
6 Request EPP Mode
5 Request ECP Mode with RLE
4 Request ECP Mode
3 Reserve
2 Request Device ID; Return Data
Using
Nibble Mode Rev Channel Transfer
Byte Mode Rev Channel Transfer
ECP Mode Transfer without RLE
ECP Mode Transfer with RLE
1 Reserve
0 Byte Mode Reverse Channel Transfer 00000001
Nibble Mode Reverse Channel
non
Transfer
Illegal or Contradictory Request
* The printer is designed to work with only Nibble/Byte and thus it responds with negative Xflag
values for request for the other modes.
EPSON
1284 Communication Mode Request values-bit assignments
Definition
TITLE
TM-U295/U295P
Specification
(STANDARD)
Valid
Bit values Hex Code
supported
10000000 80H
01000000 40H
00110000 30H
00010000 10H
00001000 08H
00000100 04H
00000101 05H
00010100 14H
00110100 34H
00000010 High
01H
00000000 00H
Other than Other than
above cases above cases
SHEET
REVISION
F
Xflag Xflag
Values Values on the
when
printer
High Low
High Low
High Low
High Low
High Low
High High
High High
High Low
High Low
Low
High High
Low Low
|
Low
NO.
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