1pc Industrial Grade RS485 Signal Repeater Amplifier Isolat

Description:
This isolated RS485E repeater is a kind of high-performance
industrial grade RS485 signal amplifier and extender. It can automatically
sense data flow direction and communication baud rate, not requiring any
control or handshaking signals, and ensure
transparent data
transmission. Equipment power supply and communication signal are
completely isolated, with
surge protection and static
protection. It features long distance transmission, high speed, stable and
reliable performance. Widely used for attendance machine, IC card charging
system, automation control, access control system, parking lot, dining service
system,
highway toll system.

Features:
Industrial grade design, communication is
completely isolated, stable and reliable performance, transmission rate is up
to 500Kbps.
Built-in high-quality DC/DC isolated power
supply module realizes electrical isolation between ports.
Support multi-machine communication, can
connect up to 128 nodes, and transmission distance is up to 1200 meters.
Data flow automatic control technology,
automatically distinguish and control data transmission direction.
Multiple protective measures: positive and
negative 15KV ESD protection; 600W dual channel TVS protection; 2.5KV
communication isolation.
Wide range of power supply from 9V to 36VDC,
and support reverse polarity protection.

Specifications:
Recommended Value (Typical)
Limit Value
Working Voltage
9V~36V DC
9V~36V DC
Rated Power
0.36W (9V/35mA; 12V/27mA; 24V/15mA)
0.5W
Working Temperature
-30℃~70℃
-40℃~80℃
Responsible for Capacity
1~128 node
128 node
Communication Distance
0~1200 meters
1200 meters
Communication Rate
300~500K bps
500Kbps
Note:
It is suggested to use RS485E equipment under
recommended value for long-term stable operation. Equipment will not damage
when working under limit value, but may result in performance degradation. Do
not exceed the limit value, otherwise it may damage the equipment.
Wiring Note:
1. 485 communication wires must be shielded
twisted pair. It is better to have multi-strand for spare, and the total length
is not more than 1,200 meters.
2. Wires should be as far as possible away
from high-voltage wires, do not parallel with the power cord and cannot be
bundled together.
3.
485 bus must
be
hand-hand
bus structure, and must not be star connection and fork connection.
4. 485 repeater must be used when there is
more than 30 controllers or wire is longer than 500 meters.
5. AC power supply equipment and case must
be grounded well.
6. Connect GND of all 485 devices with
shielded cable.
7. Connect 120 ohm terminal resistor in parallel
to 485+(A) and 485-(B) of the last 485 device.
RS-485 bus wire should be 2-core shielded
twisted pair copper wire, of diameter 0.5 to 0.75 square millimeters, impedance
38 to 88 ohms / km, capacity of 30 to 50 nanofarad / km, twist pitch is 20mm
(if wire distance is not more than 500 meters, the standard can be appropriately
lower, but must be twisted pair)
Bus Limit:
Consists of two or more devices with
physical connections between each other, the bus can be connected up to 128
devices, in the case of no repeater, the bus length is not more than 1200
meters. The system bus should not branch, and if branch is unavoidable, the
following requirements must be met:
1. Length of branch is not more than 10
meters; the sum of bus length in not more than 800 meters; the total quantity
of equipment on the branch is not more than 50.
2. All communication signal wires should be
as far as possible away from interference source, the signal line should go
weak wells, and cannot be in parallel with strong power (such as 220 volt
residential power) or RF signal wire (such as CATV, large signal audio cable).
If in parallel, the distance should be longer than 0.5 meters.
3. All wire contacts must be welded or
screwed to the connection, and do waterproof and moisture-proof treatment.
Signal Common Ground:
1. All devices on the same network segment
must have a uniform signal ground to avoid common mode interference.
2. When using centralized power supply, connect
DC negative poles of all power (including the communication device power) of
the same network segment together directly to form a common signal ground. At
this time the signal ground is the DC power ground.
3. When using individual power supply, connect
the ground (black wire) pins of all the bus devices on the same network segment
together to form a common signal ground.
Indicator Light:
PWR: Green power supply indicator light, normally
on when power on.
COM: Red data indicator light, flashes when
there is data on bus.
Terminal Definition:
DC9V: power supply
G: Isolate RS-485 ground, can connect to
earth or shielded wire
A: RS-485 signal input/output positive
B: RS-485 signal input/output negative
Recommended Debug Methods:
Make sure the wiring is correct.
1, Common ground: use 1 wire or shield wire
to connect GND of all 485 devices together, which can avoid potential
difference that influence communication between all devices.
2, Terminal resistor: connect a 120ohm
terminal resistor in parallel to 485+ and 485- of the last 485 device, in order
to improve communication quality.
3, Disconnect middle section: by disconnecting
in the middle to check if it is because there are too many loads, or
communication distance is too long, or some device is damaged that influence
the whole communication wire.
4, Single wire: connect one single wire to
device, which can be used to eliminate if the wiring causes communication
fault.
5, Change convertor: change convertor to eliminate
if the convertor quality influences communication quality.
6, Laptop debug: make sure your laptop
communicates normally, replay client's computer to communicate.

Package Includes:
1 x RS-485 Repeater
Note:
Please note that the new type and old type of this product will be sent Ran-domly, and make sure you will not mind before ordering.
.