EM401 unhappy

GPS/GNSS Development Boards
1

My Em401 seemed to quit sending.

Pin6(vcc) has 5v,

Pin5(tx) has nothing (just sits at +3v, dead)

Pin4(rx) on scope shows good RS232 signal coming in when I type using teraterm.

Pin3(/reset) I connected this to gnd momentarily to try resetting it, but didnt help.

Pin2(gnd) hasn’t changed

Pin1(gnd) hasn’t changed.

The EM401 is connected to a Eval-EM406-RS232 which I wired to work. It has worked great for 2 months in my car. Then it just stopped sending…

No matter what I do, I never see anything come out. Even connecting pin3 to gnd, didnt cause any garbage to show up on teraterm (hyperterm). At 4800, I sent it $PSRF100,1,9600,8,1,0*0C to change speed to 9600, but that didnt do anything.

Q: Can I perhaps unhook the battery somehow and get it to hard-reset somehow???

Thanks for any leads,

jim pruett

2

Jim,

Isounds like the MAX23X rs232 chip on your dev board may have died. I had a similar inexplicable problem.

Ryan

3

I called usglobalsat and they think their chipset died. They also say the warrantee is thru sparkfun which is better than if I had for example bought it off ebay in which case they said I would be SOL.

BTW, I connected pin 5,6 together to do a loopback which worked.

That eliminated the max chip.

Have fun.

jim

4

oops, I meant pins4,5.