ADH8066 Serial

Wireless & IoT
1

I’ve got an ADH8066 on a breakout board hooked up to my computer through a Prolific cable. I’m able to get the board to power up without any problems but all I ever get from it is

b[[[?~}w8=y+MOC=y

It doesn’t respond to any commands. Odd thing is that the RX light on the cable is lit all the time, but the TX light never does anything.

I’ve got the cable hooked to the board only on TX, RX, and GND.

What am I doing wrong?

2

Assuming you’ve got the Tx/Rx connections proper (not reversed) then my guess #1 is a baud rate mismatch. The datasheet says it’s supposed to be 115.2k, 8N1. What are you using at the PC end ?

See section 4 …

http://www.sparkfun.com/datasheets/Cell … onv1.3.pdf

Also note the cautions re: the peak current supply needed.

3

Thanks for the quick reply. I am using 115,200 8N1. I also tried 9600 since I saw that as the settings in some places.

As to power, I’ve got it being powered by a LiPo battery and the voltage coming out of that stays solid making me think that it is happy. I’m also getting audio and LED feedback that tells me the board is registering with the cell network.

4

Well then … how sure are you that the Tx and Rx lines aren’t crossed ? Might be worth changing them just in case. Do you have a single common ground between the cable and the BoB ?

BTW what signaling/voltage levels does your Prolific USB/serial converter use ? I’m pretty sure the ADH8066 BoB is a 3.3 V device and Tx’es out 3.3 V (max) levels.

5

Mee_n_Mac:
Well then … how sure are you that the Tx and Rx lines aren’t crossed ? Might be worth changing them just in case. Do you have a single common ground between the cable and the BoB ?

BTW what signaling/voltage levels does your Prolific USB/serial converter use ? I’m pretty sure the ADH8066 BoB is a 3.3 V device and Tx’es out 3.3 V (max) levels.

Well, I just ordered an auto-sensing 3.3/5v USB to serial adapter. I hope I didn't break anything by overvolting the module.
6

Well, I got the TTL adapter and now I’m not receiving gibberish. It actually says Ready now. But, that’s all it does. How are people talking to this thing from a Windows box? What serial program?