Hexin Technology HXJZ-877 2000m-3000m Low Power RS-232/RS-485/TTL to RF Wireless Module - Manual (Page 8)

HXJZ-877 Mini Power Wireless Module User’s Manual
Optional Antenna:
Trouble and solve ways:
Item Trouble Trouble causes and solve ways
1
No shine of
Indicator light
a、Power Line badness touch .
b、Power is bad.
c、Power line meet in reverse, or diode of polarity protect is bad.
2
No transmitting or
receiving
a、Radio is badness touch with PC/terminal.
b、Radio with TTL/RS232/RS485 not match terminal.
c、RX frequency and TX frequency is not same.
3 High Bit error rate
a、antenna not match, or touch bad;
b、RF baud rate is not right.
c、Power supply ripple is too great.
4
Indicator light
twinkling
a、Electromagnetism disturb in circumstance.
b、Same frequency disturb in the circumstance.