Datasheet

Why won’t WeatherLink work with just the serial line?

Because WeatherLink is old-school proprietary software and even requires a hardware-

provided communication handshake, achieved by:

• Connecting the RTS and CTS lines.

• Connecting the DSR, DTR and (D)CD lines.

Figure 21 and the excellent writeup by DeKay [11] refer. Oh, BTW, the entire concept

of a hardware- implemented communication handshake in the data logger is so 1980-

ish.

Figure 21: Data Terminal Equipment (DTE) pin numbering for the 25-pin and 9-pin connectors nor-

mally used for serial-line communications. In other words, the above pin numbers appear ”as seen” when

looking directly at a PC-side COM port.

Credits?

Thanks to WXForum.net users DeKay, rdsman, belfryboy, iBangkok24, franzz, watson and

kashima for sharing their excellent work.

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