Delta AH500 Manual page 318

AH5 00 M od ul e M anua l
Start bit (repeat): 16#68
Function field (FF): 1 byte is ignored.
8 - 5 6
Instrument (IA): Check whether the
instrument address received and the
instrument address sent previously are
the same.
The data types following the function
field are stored in the data registers
starting from D100. (*)