Rockwell Automation 1775-S5_SR5,D17756.5.5 User Manual PLC-3 FAMILY I/0 - Manual (Page 174)

Appendix
C
C-1
DH and DH+ Command Set
Table C.A lists the DH and DH+ commands supported by the scanner. For
detailed information on using these commands, refer to the DH/DH+
Command Set User’s Manual (publication 1770-6.5.16).
The scanner can transmit 12 different commands on the link. The
addressing method determines which command is to be sent.
Table C.A
Basic Commands
Addressing Method Command CMD (Hex) FNC (Hex)
PLCĆ2 logical data Protected writeĆblock 00 N/A
Unprotected readĆblock 01 N/A
Protected writeĆbit 02 N/A
Unprotected writeĆbit 05 N/A
Unprotected writeĆblock 08 N/A
PLCĆ3 logical binary
or
Logical ASCII word range
Write block 0F 00
Read block 0F 01
Write bit 0F 02
Write file 0F 03
Read file 0F 04
Logical ASCII data type Write block 0F 67
Read block 0F 68
Introduction