Campbell TX320, Instruction Manual

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TX320 Transmitter
Each P127 command returns a string of information. Each command requires
a different number of input locations. The first piece of information returned is
always the result code of the command. Table 5.2-1 lists the result codes and
explains them.
TABLE 5.2-1. P127 Result Codes
0 Execution successful
1 Checksum error in response
2 Time out waiting for STX character after addressing
3 Something besides STX received after addressing
4 Received a NAK
5 Timed out while waiting for an ACK
6 CS I/O not available
7 Transmit random message failure, could be no data in random buffer
9 Invalid command code
5.2.5.1 P127, Command 0: Read Time
Retrieve the GPS time from the HDR GOES transmitter. The time is
Greenwich Mean Time (GMT). A time of 153 hours, 153 minutes, 153
seconds indicates GPS time is not available.
TABLE 5.2-2. P127 Command 0: Read Time
In Loc Contents
1 Command Result Code
2 Hours (GMT)
3 Minutes
4 Seconds
5.2.5.2 P127, Command 1: Read Status
Read Status Command provides information specific to the next scheduled or
random transmission, including the amount of data in the buffers and power
supply voltage.
TABLE 5.2-3. P127 Command 1: Read Status
In Loc Contents
1 Command Result Code
2 Bytes of data in self-timed buffer
3 Time until next self-timed transmission: Days
4 Time until next self-timed transmission: Hours
5 Time until next self-timed transmission: Minutes
6 Time until next self-timed transmission: Seconds
7 Bytes of data in random buffer
8 Time until next random transmission interval start: Hours
9 Time until next random transmission interval start: Minutes
10 Time until next random transmission interval: Seconds
11 Failsafe, 1 indicates transmitter disabled due to failsafe.
12 Loaded power supply voltage, 1 amp load. (tenths of volts)
13 Average GPS acquisition time (tens of seconds)
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