A
This is the test bench configuration. Cimplicty HMI is running a project through a Rocketport quad card. This card provides four additional
com ports. Cimplicity is using MODBUS RTU as the protocol, port setting @ 9600,8,N,1 FC=H/W. The com port connects to a V.29 master modem.
The master modem runs out to a telco bridge. Presently, two (2) slave modems are connected to the bridge. Both slaves are attached to
GEFANUC VersaMax PLC's.
This is the problem. Using Listen and Modscan to monitor data packet validity, trailing data, and other extra bytes are returning after a
poll rendering the received data invalid.
ie.
Valid data
Poll [13][03][00][00][00][28][46][a6]
Response
[13][03][50][00][01][00][01][00][01][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][
00][00][00][00][00][00][00][45][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][01][00][01][00][01][00][0
1][00][01][00][01][00][00][00][00][00][01][00][00][60][47]
Invalid Data
Poll [13][03][00][00][00][28][46][a6]
Response
[13][03][50][00][01][00][01][00][01][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][
00][00][00][00][00][00][00][45][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00]<b>[80][80][20]</b>[01][00][01][00
][01][00][01][00][01][00][00][00][00][00][01][00][00][60][47]
These are samples of trailing data
[55][55][fd]
[77][77]
[33][66][ff]
What could be causing the trailing data and the invalid response, and what to do about it? How do I strip the trailing data off?
com ports. Cimplicity is using MODBUS RTU as the protocol, port setting @ 9600,8,N,1 FC=H/W. The com port connects to a V.29 master modem.
The master modem runs out to a telco bridge. Presently, two (2) slave modems are connected to the bridge. Both slaves are attached to
GEFANUC VersaMax PLC's.
This is the problem. Using Listen and Modscan to monitor data packet validity, trailing data, and other extra bytes are returning after a
poll rendering the received data invalid.
ie.
Valid data
Poll [13][03][00][00][00][28][46][a6]
Response
[13][03][50][00][01][00][01][00][01][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][
00][00][00][00][00][00][00][45][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][01][00][01][00][01][00][0
1][00][01][00][01][00][00][00][00][00][01][00][00][60][47]
Invalid Data
Poll [13][03][00][00][00][28][46][a6]
Response
[13][03][50][00][01][00][01][00][01][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][
00][00][00][00][00][00][00][45][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00][00]<b>[80][80][20]</b>[01][00][01][00
][01][00][01][00][01][00][00][00][00][00][01][00][00][60][47]
These are samples of trailing data
[55][55][fd]
[77][77]
[33][66][ff]
What could be causing the trailing data and the invalid response, and what to do about it? How do I strip the trailing data off?