Epson Multi-mode Data Controller MFJ-1278B - Manual (Page 196)

MFJ-1278B MULTI-MODE OPERATIONAL COMMANDS
CCITT ON/OFF Mode: RTTY Default: ON
The CCITT parameter selects either an internationally recognized character set (CCITT) or
the "U.S. TTY" standard. The latter is used by many older, surplus mechanical teletypes that
have been taken out of commercial service and placed into amateur use. This parameter is
only significant when in Baudot RTTY mode.
While the standards are nearly identical, stations in in the United States are advised that the
FCC requires (part 96.69(a)) stations in Baudot RTTY service utilize International Telegraph
Alphabet Number 2 (ITA No. 2) as specified by the International Telegraph and Telephone
Consultative Committee (CCITT).
Note that when CCITT is ON, Baudot RTTY codes received but not assigned in the ITA No.
2 standard are printed as they would have been had the "U.S. TTY" standard been selected.
CHANGE
Mode: AMTOR Immediate Command
The CHANGE command causes your station to switch from being the mode A "ARQ"
receiver to being the transmitter. CHANGE forces the direction of the link to switch without
using the "+?" over signal. It is valid only during a mode A connection when you are the
receiver.
CHAT
Mode: Mailbox Immediate command
The SYSOP may, at any time, break onto the mailbox's connected link. The resulting mode is
like the a typical CONVERS mode packet connection. CHAT immediately terminates any
user or forwarding operation in progress. At the point when the SYSOP invokes Chat mode,
the SYSOP and the connectee are in an actual packet QSO. This is good to discuss problems
with the Mailbox or equipment failure. CHAT mode continues until the SYSOP returns to
command mode.