PK-232 – MBX OPERATING MANUAL COMMAND SUMMARY
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Ascii Immediate Command
Mode: Command Host: AS
ASCII is an immediate command that switches your PK-232 into the ASCII mode.
ASCII is the proper mode to use if you wish to use RTTY to transmit text, data or other information
containing lower case and special characters not present in the Baudot/Murray and ITA #2 alpha-
bets or character sets. When 8BITCONV is set ON, 8-bit ASCII data may also be sent and received.
Because the ASCII character set requires a minimum of seven bits to define each character, under
worst-case conditions, ASCII is sometimes more subject to data errors and garbled text than Bau-
dot/ITA#2 at the same data rate.
ASPect "n" Default: 2 (576)
Mode: FAX Host: AY
Parameters: "n" - 1 to 6, specifying the number of FAX scan lines the PK-232 prints out of
every 6 lines received.
ASPECT controls the aspect ratio of the length to the width of a FAX image by controlling the num-
ber of lines the PK-232 prints out of each 6 received lines.
On most weather charts, the default of ASPECT 2 keeps the shapes received in the right propor-
tion. On other transmissions, you may want more resolution. See the table below for suggested
settings.
CCITT IOCs for narrow and wide carriage printers are given for each ASPECT setting below.
ASPECT CCITT IOC (narrow) CCITT IOC (wide)
1 1100 1788
2 550 (Weather Charts 576) 894
3 367 (Wirephotos 352) 596 (Weather Charts 576)
4 275 (WEFAX Satellite 288) 447
5 220 358 (Wirephotos 352)
6 183 298 (WEFAX Satellite 288)
The Index Of Cooperation, or IOC is an international measure of aspect ratio. The formula for the
CCITT IOC is:
(vertical scan line density) × (horizontal width)
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3.14159
Weather charts are transmitted at a nominal CCITT IOC of 576. ASPECT 2 is so close to this that
the charts print with no noticeable distortion.
Please note that high settings of ASPECT such as 6 may generate data so often that your printer
cannot handle the high data rate.
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