Campbell TX312, Instruction Manual

Page: 86 / 96

Appendix G. Extended ASCII Command Set
G-14
G.4.9 Test SDI-12 Command Table
Syntax:
STT
Access level: USER
TX312 State: Enabled/Disabled
This command forces the command table to be executed immediately. The
measurement results are printed to the terminal rather than being buffered for
transmission.
G.5 Data Buffer Loading Commands
The following commands are used to manage and store data in the GOES
Transmission buffers.
G.5.1 Load Self-Timed Transmission Buffer
Syntax:
TDT =xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Access level: USER
TX312 State: Enabled
This command overwrites the GOES Timed Buffer with the data provided.
The TX312 transmitter will insert the 31 bit GOES ID, any header information
(e.g. HDR Flag byte), and append the EOT so these should not be included in
the TDT data. If the timed data format is ASCII or Pseudo-Binary the
transmitter will also insert the correct parity bit for each message character and
replace illegal characters with the character specified by the
IRC=c command
before transmission.
Characters that have meaning for the command interface (CR, LF, BS,
ESC,’~’) must be preceded by a ‘~’ character if they appear in the message
data.
The maximum length of the formatted data can be up to 126000 bits, or 15750
bytes.
If there is more data loaded into the buffer than can be transmitted in the
assigned transmit window the message will be truncated.
One minute prior to transmission data is removed from the transmit buffer and
encoded for transmissiion (The Data In Buffer LED will go out). If this
command is received within 1 minute of the transmission time or during a
timed transmission, the data will not be included in the current transmission but
will be buffered for the next interval.