J101 no serial data reception

Products & Technology DSO Nano
#1

Hi, i have bought 20 j101 seeed boards. I am trying to receive neo7m gps data on ttyTHS1 dev port for which i have connected gps with j101 as

pin 8 tx to rx of gps
Pin10 rx to tx of gps
Vcc to 5v
Gnd to gnd

Im reading serial data on minicom with settings baudrate 9600 and hardware flow control NO
N sofrware flow control NO.

Unfortunately out of 20 j101 boards, i can only recrive gps data on 3 boards with same above configurations.

Please help me what am i doing wrong.

#2

make sure you tx and rx are connected correctly

controler to gps unit
tx to rx
rx to tx

next… gps may not start sending data immediatly… especially inside with a cold boot

these are the only ideas that could be hardware specific

last some gps use faster or slower speeds maybe try 4800 or 19200

also may check configuration i think neo7m has a windows app that connects thru the usb cable to access the settings in the chip

hope something helps