Sensaphone SCADA 3000 Dialup Troubles

[lfpwd]

Hi,
I am attempting to communicate with a (phonetics) sensaphone scada 3000 PLC via modbus serial dialup modem.
the Modbus service dials the unit and connects however Lookout then gives alarm:
Garbled communication response from Modbus secondary(6):Response too short
and promptly hangs up.
Any help would be greatly appreciated.
Thanks, Steve


Dial log - - - - - - -
11:28:25.7 - Modbus1 ->
ATES0=0[0D]
11:28:26.4 - Modbus1 <-
ATES0=0[0D][0D][0A]OK[0D][0A]
Modbus1 - DTR low
Modbus1 - DTR high
11:28:29.5 - Modbus1 ->
ATES0=0[0D]
11:28:30.1 - Modbus1 <-
[0D][0A]OK[0D][0A]
11:28:30.1 - Modbus1 ->
ATX4M1VEDT2063672120[0D]
11:29:11.7 - Modbus1 <-
[0D][0A]19[0D][0A]
11:29:11.7 - Modbus1 ->
[01][02][00][00][00][01][B9][CA]
11:29:12.7 - Modbus1 <-
[01][02][81][E1]
11:29:12.7 - Modbus1 ->
[01][02][00][00][00][01][B9][CA]
11:29:13.5 - Modbus1 <-
[01][02][81][E1]
11:29:13.5 - Modbus1 ->
[01][02][00][00][00][01][B9][CA]
11:29:14.3 - Modbus1 <-
[01][02][81][E1]
11:29:14.3 - Modbus1 ->
[01][02][00][00][00][01][B9][CA]
11:29:15.2 - Modbus1 <-
[01][02][81][E1]
11:29:15.2 - Modbus1 ->
[01][02][00][00][00][01][B9][CA]
11:29:16.0 - Modbus1 <-
[01][02][81][E1]

[Jeff M]

Hi lfpwd,

I have a few suggestions to try:

1. First, make sure you have the most up-to-date fixes for your particular version of Lookout. Go to the ni.com>>Drivers and Updates page found at the following link:
http://digital.ni.com/softlib.nsf/MainPage?ReadForm&node=132010_US

Then using the pull-down bars, select your version of Lookout and click "Go" to get a list of the the most up-to-date fixes. I am recommending this step, because certain fixes specifically address the error message "Garbled communication response from Modbus secondary(0):Response too short", for more information see the following KnowledgeBase:
http://digital.ni.com/public.nsf/websearch/FD124E0D30CD57CC86256B6C005757C7?OpenDocument

2. Second, try increasing the Receive Gap setting for your Serial Port in Lookout (under Options menu). By default it should be set to 20 bytes, so try a few other values such as 50 or 100 bytes and see what happens.

Please let me know if you have any success.

Thanks,

Jeff M.

Applications Engineering
National Instruments