I monitored the serial traffic of the vantage pro while connected to WsWin in live mode, and then while connected to WeatherLink in live mode (which is very fast at reflecting the current readings from the console) using this tool:
http://www.sysinternals.com/Utilities/PMon.html (very handy!)
To use it, first set the monitor into capture mode on the target port. Then run the software you want to monitor (WsWin for example). The monitor listens, but does not block the port.
There was a big difference between WsWin and WeatherLink in the traffic. It looks like WsWin might be overloading the connection with constant
IOCTL_SERIAL_GET_MODEMSTATUS/IOCTL_SERIAL_GET_COMMSTATUS pairs while in live mode. I've attached a snipped portion of the monitor log below so you can see.
Hope this helps.
Steve
WsWin
3123 0.00359710 wswin32.exe IOCTL_SERIAL_GET_MODEMSTATUS slabser0 SUCCESS
3124 0.00001090 wswin32.exe IOCTL_SERIAL_GET_COMMSTATUS slabser0 SUCCESS
3125 0.00060175 wswin32.exe IRP_MJ_WRITE slabser0 SUCCESS Length 1: .
3126 0.10990612 wswin32.exe IOCTL_SERIAL_WAIT_ON_MASK slabser0 SUCCESS
3127 0.00000587 wswin32.exe IOCTL_SERIAL_GET_COMMSTATUS slabser0 SUCCESS
3128 0.00001257 wswin32.exe IRP_MJ_READ slabser0 SUCCESS Length 2: ..
3129 0.00360716 wswin32.exe IOCTL_SERIAL_GET_MODEMSTATUS slabser0 SUCCESS
3130 0.00001090 wswin32.exe IOCTL_SERIAL_GET_COMMSTATUS slabser0 SUCCESS
3131 0.00358118 wswin32.exe IOCTL_SERIAL_GET_MODEMSTATUS slabser0 SUCCESS
WeatherLink
18971 0.00001090 WeatherLink56.e IRP_MJ_READ slabser0 SUCCESS Length 1: .
18972 0.00000922 WeatherLink56.e IRP_MJ_READ slabser0 SUCCESS Length 1: 6
18973 0.00001090 WeatherLink56.e IRP_MJ_READ slabser0 SUCCESS Length 1: .
18974 0.00000754 WeatherLink56.e IRP_MJ_READ slabser0 SUCCESS Length 1: .
18975 0.00001006 WeatherLink56.e IRP_MJ_READ slabser0 SUCCESS Length 1: .
18976 0.00000922 WeatherLink56.e IRP_MJ_READ slabser0 SUCCESS Length 1: .
18977 0.00001006 WeatherLink56.e IRP_MJ_READ slabser0 SUCCESS Length 1: K
18978 0.11006703 WeatherLink56.e IRP_MJ_READ slabser0 TIMEOUT Length 0:
18979 0.11006452 WeatherLink56.e IRP_MJ_READ slabser0 TIMEOUT Length 0:
18980 0.11005949 WeatherLink56.e IRP_MJ_READ slabser0 TIMEOUT Length 0:
18981 0.07663542 WeatherLink56.e IRP_MJ_READ slabser0 SUCCESS Length 1: L
18982 0.00001090 WeatherLink56.e IRP_MJ_READ slabser0 SUCCESS Length 1: O