API for Watchport/H

USB Edgeport
1

I’m interested in integrating readings from a Watchport/H temp/humidity sensor into an existing application. At least 1 reseller indicates that there is an API available to do this, but I haven’t been able to find it on the digi.com website. Is there such a thing (preferably C/C++ Windows and Linux)?
Thanks!

2

Although there is no API per se, you can communicate with the Watchport/H through your software application by issuing ASCII commands to get readings from the sensor for humidity and temperature.

See the Watchport/H section in the Watchport Installation Guide:
http://ftp1.digi.com/support/documentation/90000406_E.pdf

3

I have it installed on a Linux test box and it is comming up as ttyUSB0 wich is good but how do i send ASCII commands to the device from a prompt?

4

Nice, a virtual serial port - simple and clean.

Any plans for Linux support?

P.S. Thanks for the quick reply!

Message was edited by: pogo

5

The spec sheet mentions that the Watchport/H has a maximum read rate of 20/second. Using the serial protocol from the document listed above, it takes about 2 seconds to get a response to “TC”. Is that 20/second referring to an internal sampling rate, or should I be able to get 20 serial port readings per second?

6

The Watchport/H is supported in Linux.

If you’re running a 2.6 kernel, just plug it in.

If you’re running a 2.4 kernel, you’ll need to install the Edgeport Driver Package. I can e-mail this to you if needed.

Either way, once it’s installed, access the serial port as the device node “/dev/ttyUSB0”.

7

Awesome! And again I must give you kudos for the quick responses. Such an excellent level of support on an open forum is not often seen!

8

I’m working with our Engineering group to get an answer for you, which should be by early next week.

Thanks in advance for your patience!

9

Any update on this?

10

Hi,

That “20 times a second” in our datasheet is just wrong and I’ve asked that it be corrected. I sincerely apologize that we have incorrect info on our sensor. The most you’re going to be able to get is about 2 to 3 a second TOPS.

I’ll check into it again to see why this hasn’t been changed.

Again, apologies for the confusion.

Mike Swift

11

You need to use a program that’s equivalent to HyperTerminal in Windows. In other words, a program that’s able to open device nodes (similar to how HyperTerminal can open COM ports).

12

Hi Jeremym

I scripted minicom and now i get a result in a text file.

thaks for the help