Epson Multi-mode Data Controller MFJ-1278B - Manual (Page 136)

MFJ-1278B MULTI-MODE ADVANCED OPERATION
If you want to monitor stations selectively, you can set up a list of up to eight callsigns with
the command LCALLS. The callsigns in this list are regarded as "buddies," i.e., the only
stations you want to listen to if BUDLIST is ON. Otherwise, the stations in the list will be
ignored, and all other stations will be monitored.
You can operate a group conversation with some data integrity by having the stations connect
in pairs and setting MALL ON and MCON ON. This does not insure that every packet is
received at every station, but it does insure that a packet involved in a collision will be
retried. If you have an odd number of stations participating in this sort of conversation, one
station can connect to himself via another station as digipeater.
or example, WB6YMH, WD0ETZ, WA0TTW, W1BEL, and K9NG wish to carry on a group
conversation. In order to make all the transmissions as reliable as possible, the following
connections are made.
WB6YMH connects to W1BEL
WA0TTW connects to K9NG
WD0ETZ connects to WD0ETZ via W1BEL
If each station specifies MCON ON and MALL ON, each station will see the packets sent
by all the others.
Ordinarily, only text packets are displayed. If you want to see some of the protocol packets,
you can set MCOM ON and connect, disconnect, disconnect acknowledgments, and DM
(connect-request rejection) packets will be displayed. For example,
WB9FLW>N7CL <C>
KV7B>N2WX <D>
indicates connect and disconnect packets. Disconnect acknowledgments are designated
<UA>, and DM packets are <DM>.
You can cause the MFJ-1278B to "filter" certain characters from monitored packets with the
command MFILTER. This allows you to remove, for example, form-feeds, bell characters,
or extra <LF>s that may be necessary to the stations involved in a connection, but which may
interfere with your display. You can specify up to four characters by giving the ASCII
character codes in hex or decimal.
Real-Time Clock and Time Stamping
You can enable the MFJ-1278B's real-time clock by setting the date and time with the
command DAYTIME. Once you have set the clock, you can request the time by entering
DAYTIME with no parameters. The format of date and time display is controlled by the