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Command/Response Formats 73

Commands

Receiver Commands

Receiver commands change or display various receiver operating parameters such as

recording interval, antenna position, and PDOP mask. Commands may be sent

through any available serial port.

Set Commands

The general structure of the set commands is:

$PASHS,s,c <enter>

where s is a 3 character command identifier, and c is one or more data parameters that

will be sent to the receiver. For example, the set command to change the recording

interval to 5 seconds is:

$PASHS,RCI,5 <enter>

If a set command is accepted, an acknowledgment message is returned in the form:

$PASHR,ACK*3D

If a set command is not accepted, an non-acknowledgment message is returned in the

form $PASHR,NAK*30. If a command is not accepted, check that the command has

been typed correctly, and that the number and format of the data parameters are

correct.

Query Commands

The general structure of the query command is:

$PASHQ,s,c <enter>

where s is a 3 character command identifier and c is the serial port where the response

message will be sent. The serial port field is optional. If the serial port is not included

in a query command, the response will be sent to the current port. For example, if the

user is communicating with the receiver on Port A and sends the following query

command:

$PASHQ,SES <enter>

The response will be sent to port A. However, if from the same port, the users sends

the query command:

$PASHQ,SES,B <enter>

Then the response will be sent to port B.

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Ashtech Z-sensor Spécifications Page 93