AHRS-E304 Watson Industries, Inc
09/06/05
17
ADJUST TIME CONSTANTS
Consult Factory
SETTING OUTPUT FORMAT
There are two output formats.
Decimal output - “_” Command.
Binary output – “^” Command.
To change the output format:
Hook the unit up to your computers serial port.
Use hyperterminal program to interface with unit.
Turn on unit. Wait for the startup message to appear on display.
Hit the space bar twice within the first 5 seconds of turn on.
Sometimes it takes a few tries to get the hang of this.
Wait for the data string to start transmitting.
Now the unit will take in the keyboard commands. Press the key Command corresponding to the
format you want to switch into. (for example type “_” to change into Decimal Format.)
To make this format selection the default the next time you power the unit on type in'"' (double quote.)
Appendix C
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
Data Word
MSB
LSB
As the data words are received, the LSB is shifted left to shift out the sign bit. The MSB is then connected to the
LSB as a 16 bit word. This word is then shifted left to shift out the sign bit. What remains is a signed fractional
word with a resolution of 13 bits plus a sign bit.
DATA STREAM
WORD 1
WORD 2
WORD 3
WORD 4
..........
WORD N
0x0D
Carriage
Return
Byte
All of the data words have a high sign bit, but the delimiter byte is an ASCII carriage return character which has a
low sign bit. The nominal interface settings are:
9600 Baud
8 Bit Data
1 Start Bit
1 Stop Bit
No Parity
