Manual

TX320 Transmitter

Parameter 1 allows you to determine what command will be issued to the

TX320.

Parameter 2 is the starting input location for the string of information the

TX320 will return.

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 7-5 lists the result codes and

explains them.

TABLE 7-5. 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

7.6.5.1 P127, Command 0: Read Time

Retrieve the GPS time from the transmitter. The time is Greenwich Mean

Time (GMT). A time of 153 hours, 153 minutes, 153 seconds indicates GPS

time is not available.

TABLE 7-6. P127 Command 0: Read Time

In Loc Contents

1 Command Result Code

2 Hours (GMT)

3 Minutes

4 Seconds

7.6.5.2 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.