Half duplex line monitor example, Halfćduplex line monitor example, Poll with a dle eot in response – Rockwell Automation 1770, D17706.5.16 Ref Mnl DF1 Protocol Command User Manual
Page 234: Master, Slave
14–2
Line Monitor Examples
Publication 1770Ć6.5.16 - October 1996
When monitoring half-duplex protocol in two-wire mode, you need
to monitor only one line. The example below shows a message sent
by the master and a reply sent by the slave in response to a poll.
Slave responses are in boldface:
Message from master to slave and slave acknowledgement:
DLE SOH stn DLE STX message DLE ETX CRC DLE ACK
Message sent from slave to master in response to poll and slave
acknowledgement:
DLE ENQ stn BCC DLE STX message DLE ETX CRC DLE ACK
Poll with a DLE EOT in response:
DLE ENQ stn BCC DLE EOT
Use the following CRC example to verify your CRC routine:
CMD
01
STS
00
SRC
07
TNS
4100
DLE
10
DST
11
STX
02
DLE
10
SOH
01
STN
11
ADDR
1200
master:
SIZE
0C
DLE
10
CRC
CF 40
DLE
10
ACK
06
slave:
BCC
EF
DLE
10
ENQ
05
STN
11
master:
TNS
4100
SRC
11
STS
00
CMD
41
DLE
10
STX
02
DST
07
DATA
00 00 00 00 00 00 00 00 00 00 00 00
slave:
DLE
10
ETX
03
CRC
CF 40
ETX
03
ENQ
05
BCC
EF
STN
11
DLE
10
ACK
06
DLE
10
master:
DLE
10
EOT
04
slave:
HalfĆduplex Line Monitor
Example