Modbus comm fails

[SGL]

Lookout alarm messages (comm fails) occur with Lookout 6.5 running on Windows 7 computer.  Comm fails do not occur with Lookout 6.5 running on Windows XP computer.  Communications are dial-up mode.  Both computers have Conexant modems. 

Communicaton protocol in Modbus serial.

[Ryan.S]

Select Option->Serial Port, enable the diagnostic file, input a txt file path. The modbus communication will be logged to the txt file. Attach the log file here.

[SGL]

Ryan:

Attached is a text file showing successful connection (8309 number) and unsuccessful connection (6380 number). 

Lookout 6.5 installed on Dell Vostro computer, Windows 7 OS

Modem = Conexant D850 PCI V.92

Lookout will only connect to about half of the remote sites.  

I also have Lookout on my laptop.  Dell D630 Latitude   Windows XP  Conexant HDA D330 MDC V.92 modem.  The laptop will connect to all of the remote sites successfully.

Thank you.

Steve Lowry

717-649-9060

[Ryan.S]

This is the good one

14:21:56.8 - Modbus1 ->
ATX4VEDT1-410-861-8309[0D]
14:22:27.2 - Modbus1 <-
62[0D]

This is bad

14:23:33.8 - Modbus1 ->
ATX4VEDT1-410-386-6380[0D]
14:24:29.0 - Modbus1 <-
3[0D]

It looks like the modem cannot access the number. The only difference is just the number.

You can use the hyperterminal to test the modem. Take a look at this kB

http://www.ni.com/support/serial/verhyper.htm

Type

ATES0=0

ATX4VEDT1-410-861-8309

You should get the response like the one in log file. The [0D] is the carriage return.

If it works, then try the "bad" number

ATES0=0

ATX4VEDT1-410-386-6380