Ricoh M281 Series Service Manual page 940

Bit Switches - 4
No Function
0-3 Not used
4 DIS frame length
0: 10 bytes 1: 4 bytes
5 Not used
6 Forbid CED/ANsam output
0: Off
1: On (Forbid output)
7 Not used
No Function
0 G3 protocol mode used
0: Standard and non-standard
1: Standard only
1-6 Not used
7 Short preamble
0: Disabled 1: Enabled
No Function
0 DIS detection number
(Echo countermeasure)
0: 1
1: 2
1 Not Used
D255/D256 FAX OPTION
Do not change the settings.
1: The bytes in the DIS frame after the 4th byte
will not be transmitted (set to 1 if there are
communication problems with PC-based faxes
which cannot receive the extended DIS frames).
Do not change the setting.
Do not change this setting (Default: 0: Off),
unless communication problem is caused by a
CED or ANSam transmission.
Do not change this setting.
G3 Switch 02 (SP No. 1-105-003)
Change this bit to 1 only when the other end can
only communicate with machines that send
T.30-standard frames only.
1: Disables NSF/NSS signals (these are used in
non-standard mode communication)
Do not change the settings.
Refer to Appendix B in the Group 3 Facsimile
Manual for details about Short Preamble.
G3 Switch 03 (SP No. 1-105-004)
0: The machine will hang up if it receives the
same DIS frame twice.
1: Before sending DCS, the machine will wait for
the second DIS which is caused by echo on the
line.
Do not change the settings.
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