Rockwell Automation 1403-NSC Smart Communication Card Instruction Sheet - Manual (Page 47)

C–3 Serial Communication Protocol Tutorial
Publication 1403-5.1
Table C.3 Write Sequence
Transmitted from Serial
Network Master
Description/
Direction
Transmitted from
Smart
Communication
Card
[ DLE / SOH / STN / DLE /
STX / DST / SRC / 0x0F /
0x00 / 0x00 / 0x00 / 0xAA
/ data_size / 0x00 / 0x89 /
0x00 / 0x00 /
1st_dataword_lo /
1st_dataword_hi /.../
last_dataword_lo /
last_dataword_hi / DLE /
ETX / CRC ]
Write Data
DF1 Ack
[ DLE / ACK ]
[ DLE / ENQ / STN / BCC ]
(Note: should wait for
application ack, time-out,
and repeat poll until data
is received)
Poll
Application
Ack
[ DLE / STX / DST /
SRC / 0x4F / STS /
TNS / TNS /Ext_STS
(if error) / DLE / ETX
/ CRC ]
[ DLE / ACK ]
DF1 Ack
Table C.4 Read Sequence
Transmitted from Serial
Network Master
Description/
Direction
Transmitted from
Smart
Communication
Card
[ DLE / SOH / STN / DLE /
STX / DST / SRC / 0x0F /
0x00 / 0x00 / 0x00 / 0xA2 /
data_size / 0x00 / 0x89 /
0x00 / 0x00 / DLE / ETX /
CRC ] Read
Request
DF1 Ack
[ DLE / ACK ]
[ DLE / ENQ / STN / BCC ]
(Note: should wait for
data, time-out, and repeat
poll until data is received)
Poll
Data
[ DLE / STX / DST /
SRC / 0x4F / STS /
TNS / TNS /
1st_dataword_lo /
1st_dataword_hi /.../
last_dataword_lo /
last_dataword_hi /
DLE / ETX / CRC ]
[ DLE / ACK ]
DF1 Ack