Hexin Technology HXJZ-878 User Manual

HXJZ-878 RF Data Radio

User’s Manual

HXJZ-878 RF Data Radio User’s Manual

About HXJZ-878

HXJZ-878, the Middle power wireless Radio, is used as the wireless data

transmission and power consumption and good stability and reliability,

It has the function of bi-directional data sign transmission, test and control. It is used for Wireless meter
reading, such as water meter, electric meter and gas meter, parking meter, intellective
card, electronic weighing apparatus, meter for checking on work attendance, queue wireless meter, building
control, shipping company control, alarm system, intelligent equipment, Automatic data collecting
system; Industrial remote control and remote test building automation, safety and security,
powerhouse equipment wireless monitor, entrance control system, etc.

HXJZ-878 Feature

1. Power and receiving sensitivity

transmission power :5W, high receiving sensitivity: -123dbm.

2.

Low consumption

RX current: < 45mA, TX current:1.5A.

3. Modulation mode and Frequency

Modulation mode: GFSK, Frequency: 433MHz.

4.High anti-interference and low BER (Bit error Rate)

Based on the GFSK modulation mode, it adopts the efficient communication protocol. The
actual bit error rate of 10-5~ 10-6can be achieved when channel bit error rate is 10-2.

5. Long transmission distance

when the antenna is higher than 8m ,Within the range of visibility, the reliable transmission distance is
（BER=10-3/1200bps）>20KM,（BER=10-3/9600bps）>10KM .

6. Transparent data transmission

Transparent data interface is offered to suit any standard or nonstandard user protocol. Any false
data generated in the air can be filtrated automatically (What has been received is
exactly what has been transmitted). The charge time for receiving and sending <10ms.

7. Multi-channel and speed

The standard HXJZ-878 configuration provides 16 channels to meet the multiple communication combination

mode of the users. It has baud rate to be chosen such as 1200bps、2400bps、4800bps、9600bps、19200bps、
38400bps. The wireless transmission rate is direct ratio with baud rate of interface to meet user’s equipment
requirement.

8. High speed wireless communication and large data buffer

When the speed rate in the air is quicker than interface’s, allowing to transmit unlimited length data at
one time, when the speed rate is slower or equal the interface’s, allowing the transmission of 255 Bytes long
data frames at one time for more flexible programming by users.

9. Intelligent data control and the user doesn’t need to prepare excessive programs

HXJZ-878 RF Data Radio User’s Manual

Even for semi duplex communication, the user doesn’t need to prepare excessive

programs, only
receiving/transmitting the data from the interface. HXJZ-878 will automatically complete the
other operations, such as transmission/receiving conversion in the air, control, etc.

10. High reliability, small and light

Single chip radio- frequency integrated circuit and single chip MCU are used for lessened
peripheral circuits, high reliability, and low failure rate.

11. Watchdog monitor

Watchdog monitors the inner function, so that change the traditional product structure and improve the
product reliability.

Main Parameters

1. Integration Parameters

Frequency range: 433MHZ

Channel interval: 25KHz

Frequency stabilization: +2.5PPM

Modulation mode: GFSK

RF Baud Rate: 1200/2400/4800/9600/19200/38400bps

Channel amount: 16

Antenna impedance: 50

Temperature: -20～85C

Working humidity : 10%～90% relative humidity without condensation

Weight: 200g

Size: 109mm*79mm*30mm (not include antenna and Data interface)

2. RX parameters:

Receive sensitivity: -123dbm

Next channel Power: ≥ 65dB

Modulate frequency: ≤ ±5.0KHz

3. TX parameters

RF Power： 5W

Neighbour channel Power： ≥ 65dB

Change time for receiving and sending：<10ms

4. RS-232/RS485 interface

Baud rate： 1200/2400/4800/9600/19200/38400bps

Data format：8N1

5. Power supply

9-15V DC, Standard: 12V

6. Power consumption

RX current：≤ 45mA

TX current：≤ 1.5A

HXJZ-878 RF Data Radio User’s Manual

2

HXJZ -878

HXJZ-878 consists of transmitter, receiver, base band, Modem, CPU、RS-232 as follows:

Interface:

1、 HXJZ-878 interface:

5

6

4

1

2

3

（1）Install orifice: Install and fixation HXJZ-878.
（2）User interface: DB9 male Plug;
（3）Power Plug: 2nd pin, right pin is anode, the left pin is cathode;
（4）Antenna interface: N type TNC tie-in, female core , screw thread outside, impedance is 50Ω .
（5）TX/RX indicator light: Red light blink when TX, Green light blink when RX.
（6）Power indicator light: Green blink.

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

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.

HXJZ-878 RF Data Radio User’s Manual

HXJZ-878 parameters setting

HXJZ-878 have one interface of TTL、RS232、RS485, You must specify the interface when you order. HXJZ-

878

main parameters: COM baud rate and verify，RF baud rate, Channel and frequency。

You can change these parameters by our RF Module software. When RF baudrate is
faster than COM baudrate，One frame Can transmit limitless data. When RF baudrate is not faster than
COM baudrate ，One frame Can transmit 255 bytes. You can set the rate according your request.
Two HXJZ-878 communication must have conditions as follows:

1. Their channels (i.e. frequency) is same.

2. Their RF rates is same.

3. RF Module Com baud rate and verify is agree with its equipment or PC that it connects with.

1) Parameters default value:

Channel： 1
Interface speed rate：9600BPS
Interface verify：none

Speed rate in air：9600BPS

2) Channel and frequency

list

Channel

Frequency

Channel

Frequency

1

430.2000MHZ

9

458.5250MHZ
2

431.4288MHZ

10

459.1250MHZ

3

431.7360MHZ

11

459.5250MHZ
4

430.5072MHZ

12

460.1250MHZ
5

434.6940MHZ

13

460.5250MHZ

HXJZ-878 RF Data Radio User’s Manual

6

434.2332MHZ

14

461.1250MHZ
7

433.1580MHZ

15

461.5250MHZ
8

433.9260MHZ

16

462.1250MHZ

Technical specification of HXJZ-878

Modulation mode: GFSK
Working frequency: 430-470MHZ
Transmission power: 5W
Receiving sensitivity: ­123dBm Transmitting current::
<1.5A Receiving current:

<45mA
Channel speed rate: 1200/2400/4800/9600/19200/38400Bit/s,User can Choose one
Interface speed rate: 1200/2400/4800/9600/19200/38400Bit/ s,User can Choose one
Change time for receiving and sending: <10ms
Interface data format: 8E1/8N1/8O1
Power supply: 9-15V DC

Working temperature: -20℃～65℃
Working humidity: 10%～90% relative humidity without condensation
Dimension:109mm×79mm×30mm (not include antenna and Data interface)

Attachable Communication with Model: JZ871/JZ872/JZ873/HXJZ-878

Model and name

JZ

878

-T

T：TTL interface
2：232 interface
4：485 interface

Trouble and solve ways

878A: low rate (1200-4800bps)
878B: High rate(1200-38400bps)

Company Logo

NO.

Trouble

Trouble causes and solve ways

1

No shine of
Indicator light

a、Power Line(+12V) badness touch .
b、Power(+12V) is bad.
c、Power line(+12V) meet in reverse, or diode of polarity protect is bad.

HXJZ-878 RF Data Radio User’s Manual

2

No transmit or
No receive

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

Bit error rate High

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.