PK-232 – MBX OPERATING MANUAL COMMAND SUMMARY
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6BIT command. The 6-bit unit is a compromise between hexadecimal and 8-bit binary output, The
6-bit unit yields shorter disk files than 4-bit hexadecimal characters, but encounters no interfer-
ence from terminal communications programs and the TNC's Converse and Command modes. The
6-bit unit's range of $30-6F falls within the printable ASCII range, allowing the TNC to insert end-
of-line carriage returns that can be ignored by the user's analysis software.
To use SAMPLE, set ACRDISP to a non-zero value such as 77. This will break up the recorded disk
file into lines. Tune in the signal, set WIDESHFT ON or OFF as needed, and get the transmission
rate from the SIGNAL command. Now type "SAMPLE (rate)". As an example, SIGNAL may identify
a transmission as 96 baud TDM; in this case type the following:
SAMPLE 96 <Carriage Return>
Now begin the capture to a disk file with the terminal program. At the end of the session, edit the
disk file and remove any TNC commands that were echoed before or after the received data.
Occasionally SIGNAL will identify a Baudot transmission at a rate that SAMPLE cannot sync up on.
This would happen if the Baudot signal had a stop bit duration 1.5 times the data bit duration. In
this case, SAMPLE at twice the baud rate and compensate for the doubled data bits in the analysis
software. Note that it might be more useful to let the TNC do the start/stop bit work by using the
5BIT command rather than SAMPLE. 5BIT uses RBAUD, and adds a constant of hex 40 to each 5-
bit character received.
Note: RXREV does affect the sense of the SAMPLE data.
RXREV should however not be changed while capturing data.
SELfec aaaa[aaa] Immediate Command
Mode: AMTOR FEC Host: SE
Parameters: aaaa - Specifies the distant station's SELective CALling code (SELCALL).
The SELFEC command starts a SELective FEC (Mode Bs) transmission to a specific distant station
when you enter that station's SELCALL (SELective CALLing) code. The SELFEC command must be
accompanied by a unique character sequence (aaaa) that contains four or seven alphabetic char-
acters. You do not have to type the SELCALL a second time if you intend to call the same station
again right away.
See MYSELCAL and MYIDENT to enter your 4- and 7-character SELCALLs. Other AMTOR com-
mands are ACHG, ACRRTTY, ADELAY, ALFRTTY, ARQTMO, EAS, HEREIS and RECEIVE.
SEndpac "n" Default: $0D <CTRL-M>
Mode: Packet Host: SP
Parameters: "n" - 0 to $7F (0 to 127 decimal) specifies an ASCII character code.
Use the SENDPAC command to select the character used to cause a packet to be sent in Converse
Mode. The parameter "n" is the ASCII code for the character you want to use to force your input
to be sent. Use default SENDPAC value $0D for ordinary conversation with ACRPACK ON to send
packets at natural intervals.
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