Manual

HXJZ-878 RF Data Radio User’s Manual
2、 HXJZ-878 Interface define:
1） User interface:
HXJZ-878 have one interface of TTL/RS232/RS485, user can choose one
Item no
PIN
Description
User terminal
Remarks
1
Null
2
TXD/A
Serial data transmitting end
RXD/ A (RS-485)
3
RXD/B
Serial data receiving end
TXD/ B (RS-485)
5
GND
Ground
DGND/AGND
4,6,7,8,9
Null
Item no
PIN
Description Level
Connected
to the terminal
User terminal
Remarks
1
GND
Ground
2
+12V
+12V DC
9-15V DC
Standard: 12V
Remarks: To avoid to connect the interface reverse and can not communicate, please check and assure the
voltage of 3 and 4 pin is existing by using multimeter. If there is one pin that has the voltage, another has not
voltage, which means the interface is connected reverse, please change the connection wires between pin 3
and 4.
2）Power supply
HXJZ-878 power supply is 9-15V DC，Representative value is +12V DC，the current greater than 3A。
It can also share power supply with other equipment, however, the high quality power
supply with desirable ripple factor should be selected.
In addition, the reliable grounding must be used if there is other device in the system equipment. In case
of failure to connect with the earth, it can form its own grounding, but it must be absolutely separated from the
municipal electric supply.