2 Channel Isolated RS485 Repeater 9-36VDC

2 Channel Isolated RS485 Repeater 9-36VDC Description

1、Complete Isolation of Communicating: The repeater module adopts industrial grade design, with complete isolation of communicating, stable and reliable performance, and transmission rate up to 300Kbps. 2、Isolated Power Module: The repeater module has a built in excellent DC DC isolated power module to achieve electrical isolation between ports. 3、2 Channel Output: Repeater module supports 2 channel output, multi machine communicating, up to 256 nodes can be connected to a single channel, and the longest transmission distance is far. 4、Automatic Control Technology: 2 channel repeater has data flowing automatic control technology, which automatically discriminates and controls data transmission direction. 5、Multiple Protection Measures: 2 channel repeater has positive and negative 15KV ESD protection, 600W dual TVS protection 2.5KV communicating isolation. 6、Wide Power Supply: The 2 channel repeater has a wide power supply range of 9-36VDC with reverse connection protection and supports standard rail mounting.
Item Type: Repeater Module
Material: PP
Operating Voltage
Typical Value: DC 9-36V
Limit Value: DC DC40V
Power Rating
Typical: 0.36W (9V/35mA; 12V/27mA; 24V/15mA)
Limit Value: 0.5W
Operating Environment
Typical: Temperature: -30 To 80 Humidity: >95%RH
Limit Value: -40 To 85
Isolation Voltage
Typical: 2000V
Limit Value: 2500V
Interface Protection
Typical: 600W Thunder Surge
Limit: 600W
Load Capacity
Typical: 1-128 Nodes
Limit: 256 Nodes
Communicating Distance
Typical: 0-1500m
Limit: 2000m
Communicating Speed
Typical: 300bps-115.2Kbps
Limit Value: 300Kbps
Size: Approx. 100 x 54 x 32mm / 3.9 x 2.1 x 1.3in
The Meanings Of The Status Indicators On The Front Are As Follows:
Power Indicator: Red Power Indicator, Always On After Power On
Data Indication: Green Data Indicator, Blinking When There Is Data On The Bus
The Interface At The Terminal Of The Wiring Column Is Defined As Follows
VCC: Power Supply Interface (DC 9-36V)
GND: Negative Power Supply Terminal
485 A: RS485 Signal Input Or Output Positive Terminal
485 B: RS485 Signal Input Or Output Negative
485 A2: Second RS485 Signal Input Or Output Positive
485 B2: Second RS485 Signal Input Or Output Negative
GND: Isolated RS485 Terminal Ground, Can Be Connected To Earth Or shielding Wire
485 A1: First RS485 Signal Input Or Output Positive
485 B1: First RS485 Signal Input Or Output Negative
How to Use:
A. 485 wiring notes:
1. 485 communicating line must be shielded twisted pair, preferably with multiple spare strands, and the total length is recommended not to exceed 1500 meters.
2. The wiring should be as far away as possible from the high voltage power lines, not in parallel with the power lines, and not bundled together.
3. 485 bus must be a hand in hand bus structure, firmly eliminate the star connection and bifurcation connection.
4. More than 30 controllers or line longer than 500 meters, it is recommended that the 485 repeater must be used.
5. AC powered equipment and chassis must be real grounded, and well grounded.
6. Connect the GND ground of all 485 devices with shielded wire.
B. communicating using RS485 bus wire selection requirements:
Use 2-core shielded twisted pair wire
Copper, wire diameter 0.5 - 0.75 square millimeters.
Impedance 38 - 88 ohms / km.
Capacitive resistance of 30 to 50 nF/km.
Stranding distance of 20 mm of 2 core shielded twisted pair (if the distance of the line does not exceed 500 meters can be appropriately reduced line standards, but must be twisted pair)
C. Bus limits:
Composed of two or more devices with physical connection to each other, a maximum of 256 devices are allowed to be hooked up on the bus, and the bus length is no more than 1500 meters without adding repeaters. The system bus should not have branches, and if branches are unavoidable, the following requirements must be met:
1. the branch length is no more than 10 meters; the sum of the bus length is no more than 800 meters; the total number of devices on the branch line is recommended to be no more than 50.
2. All communicating signal lines should be as far away from the source of interference as possible, signal lines should go to the weak well, not with strong power (such as 220 volt residential power) or RF signal lines (such as CATV, large signal audio lines) parallel lines, if parallel lines, the distance should be greater than 0.5 meters.
3. All line joints must be welded or doweled tight connection, and waterproof treatment, for example, the butt welded with waterproof tape or epoxy resin sealing treatment.
D. Signal common ground:
1. All devices on the same net segment must have a unified signal ground to avoid common mode interference.
2. centralized power supply, all the power supply on the same net segment (including communicating equipment with their own power) of the negative DC terminal directly connected together to form a common signal ground, the signal ground is the DC power ground.
3. When a single independent power supply, the ground (black line) pins of all bus devices on the same net segment are connected together, thus forming a common signal ground.
1 x Repeater