ashtech HDS800, Reference Manual

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Using Serial Commands
In response to a well recognized and properly executed set
command, the receiver will return the message:
$PASHR,ACK*3D
A set command is said to be “NAKed” when it is not accepted
or acknowledged. The following message is then returned:
$PASHR,NAK*30
If this happens, check that the command has been typed
correctly and the number and format of parameters are
correct. In some cases, the execution of a set command may
be contingent upon the prior activation of the corresponding
firmware option.
Checksum Calculation : The checksum is computed by
“exclusive-ORing” all of the bytes in the message between,
but not including, the “$” and the “*”. The result is “*hh”
where h is a hexadecimal character.
Applying Commands Through Bluetooth or a Serial Port
From the Office
Computer
Use GNSS Solutions’ WinComm utility, or any terminal
emulation program such as HyperTerminal (a standard
Windows communication accessory), to send serial
commands to the receiver.
Interfacing the chosen program with the receiver is achieved
by establishing a connection through one of the computer’s
COM port (a serial data cable is then required), or using
Bluetooth if this device is available on the computer.
For more information on WinComm, see GNSS Solutions
Reference Manual or WinComm On-Line Help.
When using HyperTerminal, perform the following settings
after creating a new connection (serial ports on Ashtech
receivers are usually set as follows: 19200 Bd, 8 data bits, 1
n
Used in the syntax of responses to query commands to indicate that
a sequence of parameters will be repeated “n” times in the response.
For example, n(f1,f2,f3) means the response will include the
sequence “f1,f2,f3,f1,f2,f3,f1,f2,f3...”. The value of n is specific to
each command.
s.. Character string
*cc Checksum
String or
sign
Description