TrueTime 151-602 - 3-253 SERIAL FUNCTION F53 - OPERATIONAL MODE ENTRY;REQUEST; 3-255 SERIAL FUNCTION F55 - ALTITUDE UNITS ENTRY;REQUEST

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3-253 SERIAL FUNCTION F53 - OPERATIONAL MODE ENTRY/REQUEST
Use Serial Function F53 to select the operational mode, either AUTO, SURVEY (STATIC or DYNAMIC)
or TIME. For an explanation of these modes refer to section 3-10, "OPERATIONAL MODES". The
power-up default is the mode in use at power-down. To request the present mode, send F53<CR> to
the Serial Port. The port will respond with the ASCII character string:
F53<SEP><MODE>:<SEP><#><SEP>SATS<LT>
where:
F = ASCII character F
53 = function number
<SEP> = one or more separator characters; either space, comma or tab
<MODE> = AUTO, SURVEY STATIC, SURVEY DYNAMIC or TIME
: = ASCII colon
<SEP> = space
<#> = number of SV's being tracked
<LT> = line terminator, either a carriage return and line feed for output strings or a
carriage return only for input strings
Sample request: F53<CR>
Response: F53 SURVEY STATIC: 6 SATS<CR><LT>
To enter TIME mode, send the following character string:
Sample entry: F53<SP>TIME<CR>
Response: OK<CR><LF>
Sample request: F53<CR>
Response: F53 TIME: 5 SATS<CR><LF>
3-254 reserved
3-255 SERIAL FUNCTION F55 - ALTITUDE UNITS ENTRY/REQUEST
Use Serial Function F55 to select the altitude units, either feet or meters. The as-shipped default is
meters. The altitude units at power-up will be the units in use at power-down. To request the altitude
units presently in use, send F55<CR> to the Serial Port. The port will respond with the ASCII character
string:
F55<SEP><UNITS><LT>
where:
F = ASCII character F
55 = function number
<SEP> = one or more separator characters; either space, comma or tab
<UNITS> = FEET or METERS
<LT> = line terminator, either a carriage return and line feed for output strings or a
carriage return only for input strings