Campbell Scientific TX312 High Data Rate GOES Transmitter - Manual (Page 21)

TX312 Transmitter
number of records to be copied each time GoesData is executed. When
copying data, the entire record is copied from the datalogger to the TX312
transmitter.
5.1.1.4 Buffer Control
Buffer Control is used to determine which buffer data is copied to, and if the
buffer is erased before data is copied to the buffer. Use Zero to append to the
self-timed buffer, use 1 to overwrite the self-timed buffer. Use 2 to append to
the random buffer, and 3 to overwrite the random buffer.
5.1.1.5 Data Format
Data Format is used to determine what format the data is transmitted in. This
is the format of the data sent over the satellite. The TX312 does not determine
the actual data format used, but can be set to match for data format selected
with the GoesData instruction. Use zero for CSI floating point pseudo binary.
Use 1 for floating point ASCII. Use 2 for 18 bit signed integer pseudo binary.
Options 3 through 8 are used for RAWS7 or Fire Weather applications.
Option 9 is used to clear the random buffer.
In dataloggers that support strings as a data type, all data format options except
3 (RAWS7) will support strings. Strings are transmitted from the first
character until the null terminator. If strings contain illegal characters, the
TX312 will replace the character with another character. By default the
replacement character is an asterisk. The replacement character can be
changed.
Both the random and timed buffers of the TX312 can be set to
accept ASCII or Pseudo Binary data. If the TX312 is set to
Pseudo Binary, all ASCII data is transmitted as the replacement
character, which is an Asterisk by default. When the TX312 is
set to ASCII data, both Pseudo Binary and ASCII data are
transmitted normally. Data format options zero and 2 are Pseudo
Binary, all others are ASCII. NOTE
When transmitting random messages in pseudo binary format the
message counter must be turned off (RMC=N). The message
count is a simple 3 digit count of how many times the
transmission has been repeated. Digits (0 - 9) are not legal
characters in pseudo binary mode and are replaced at
transmission time with the replacement character specified by
the IRC command. The default IRC character is *. If the random
message counter is on when the random data format is set to
pseudo binary, the first 3 characters sent are 0x20,0x20,0x2a
(space,space,*) instead of the intended 0x20,0x20,0x31
(space,space,1). NOTE
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