Epson Multi-mode Data Controller MFJ-1278B - Manual (Page 224)

MFJ-1278B MULTI-MODE OPERATIONAL COMMANDS
FAXNEG ON/OFF Mode: FAX Default: OFF
Parameters:
ON
Reverses the FAX image on screen..i.e. black to white
OFF
Disables FAX image reversal. Normal operation.
Setting FAXNEG ON causes the MFJ-1278B to invert the screen image. This means the
white areas of the FAX pictures will be black, and the black areas to be white. The
synchronization bar is not inverted.
FAXREV ON/OFF
Mode: FAX Default: OFF
When FAXREV is turned ON, the MFJ-1278B will invert all received FAX data including
synchronization bars. It is analogous to RXINVERT as used by RTTY/ASCII modes.
FEC
Mode: AMTOR Immediate Command
FEC immediately causes the MFJ-1278B to start broadcasting with the AMTOR mode
B,Forward Error Correction (FEC) protocol.
When the FEC command is issued, the MFJ-1278B keys the transmitter and is immediately
ready to accept text to transmit. Type K or CONV to enter the text transmit mode. When
you're done transmitting, enter CTL-C and type R to release the transmitter and return the
MFJ-1278B to standby/receive.
FIRMRNR ON/OFF
Mode: Packet Default: OFF
FIRMRNR controls the handling of busy states by the MFJ-1278B. Setting FIRMRNR ON
improves channel efficiency, but is incompatible with earlier TNC-2 releases. The
incompatibility is a result of vague protocol specifications.
FIRMRNR should be always be set ON when conversing with network nodes, for example,
NET/ROM. In other cases, it is recommended that FIRMRNR be left OFF unless you can be
assured the other TNC you are connected to supports FIRMRNR.