GE ASTAT Plus - Page 34

6. Appendix
The response from the Astat Plus will contain the same slave address and function code, but the data field will include the total number
of chars read, and the value of the requested parameters.
Quiet Time Slave Address Function Code Data Field CRC Quit Time
#of chars
3.5 chars slave# 17 parameters read 2 chars 3.5 chars
.
Examples
Supposing we are trying to communicate with slave 17 (note that 17 is 11h):
- To read parameters 3, 4, 5 and 6
Quiet Time Slave Address Function Code Data Field CRC Quit Time
0003
3.5 chars 11 03 0004 2 chars 3.5 chars
- To write values 1, 2 and 3 in parameters 9, 10 and 11
Quiet Time Slave Address Function Code Data Field CRC Quit Time
0009
3.5 chars 11 10 0003 2 chars 3.5 chars
06
0001
0002
0003
-To execute the above 2 commands in one
Quiet Time Slave Address Function Code Data Field CRC Quit Time
0003
3.5 chars 11 17 0004 2 chars 3.5 chars
0009
0003
06
0001
0002
0003
Quiet time Slave Function Code Data Field CRC Quiet
Address time
starting address to read
# of parameters to read
3.5 chars slave 17 #starting address to write 2 chars 3.5 chars
# of parameters to write
# of chars to write
values to write
6-7