Get no data - only output =>

[knatzkopp]

hello, I'm from germany and have a eHz EMH (http://wiki.volkszaehler.org/hardware/channels/meters/power/edl-ehz/emh-ehz-h1?s [] = emh) with my knowledge run the same SML Protocoll. Now, I came across your nodejs-implementation and wanted to use it.
I have run the current node 0.10.22 and also the current serialport. If I let your readSML run on COM3 port, there comes in the commandline only one output "=>" nothing else on. Where could I start with troubleshooting? When I run a simple script with data stream, then I get traffic on COM3. I am using Windows Server, but it should run through the same node implementation.
Thanks und greetings
Jakob