PMB 688 Pin Assignment Inconsistency !!!!
I have just got my PMB688 Module and I noticed that the bads on the back of the PCB are inconsistent with those listed in the specification file posted for Parallax part#28501:
http://www.parallax.com/Portals/0/Downloads/docs/prod/sens/PMB-688_Specification_V0.1.pdf
Which one should I follow? Should I ignore what's written on the module and stick to the posted specification???
Your quick response is highly appreciated.
Best Regards,
http://www.parallax.com/Portals/0/Downloads/docs/prod/sens/PMB-688_Specification_V0.1.pdf
Which one should I follow? Should I ignore what's written on the module and stick to the posted specification???
Your quick response is highly appreciated.
Best Regards,
Comments
I have one of these, PMB-688, and I'm very familiar with it.
There is no discrepancy between the doc (linked) and the silk-screen (on my device.)
N.B. - The device is depicted with the shiny metal case up and the antenna down.
Looks like I'm eating crow tonight!
Pin 4 is Ground blk
Pin 3 is +V (5V) red
Pin 2 is "RX" blu
Pin 1 is "TX" yel
wht and grn are not conn'd (as far as I know.)
So, I get a reprieve from that crow dinner.
PE - When I wired mine up, I just went with the wiring presented on the pdf (your doc as linked) and gave no consideration to those pads or their labels.
The order of those pads does not correspond to the layout of the pins in that connector.
The assumption that the pad labels correspond to the order of the pins is invalid.
The pins as depicted/presented in the documentation linked are accurately rendered.