A text to understand the difference between RS485 and ARINC485

Rs485 features

1. Electrical characteristics of RS-485: Positive signal with differential signal. Logic "1" means the voltage difference between the two lines is + (2~6)V; logic "0" is the voltage difference between the two lines - ( 2~6)V indicates. The interface signal level is lower than that of RS-232-C, so it is not easy to damage the chip of the interface circuit, and this level is compatible with the TTL level, which can be easily connected with the TTL circuit.

2. The maximum data rate of RS-485 is 10Mbps.

3. The RS-485 interface is a combination of a balanced driver and a differential receiver. The resistance to common-mode interference is enhanced, that is, the noise immunity is good.

4. The maximum communication distance of RS-485 is about 1219m, and the maximum transmission rate is 10Mbps. The transmission rate is inversely proportional to the transmission distance. The lower the transmission rate, the longer the transmission distance, and the longer the communication distance than RS-485 is. Distance, need to add 485 repeaters. The RS-485 bus generally supports 32 nodes at most. If a special 485 chip is used, it can reach 128 or 256 nodes, and the largest can support up to 400 nodes.

A text to understand the difference between RS485 and ARINC485

RS485 parameter index

● Interface standard: Compatible with EIA/TIA RS-485, asynchronous two-wire half duplex and RS422 asynchronous four-wire full duplex

● Communication speed: 300bps-115.2Kbps, built-in Turbo Turning, automatic selection of baud rate

● Input: two-wire RS-485, (485+, 485-), four-wire TX+, TX-, RX+, RX-

● Output: two-wire RS-485 (485+, 485-), four-wire TX+, TX-, RX+, RX-

● Connector: plug-in type terminal block, (5.08mm)

●Isolation voltage: 3000V

● Port protection: Built-in TVS (common mode and differential mode) and self-healing fuses, power over-voltage protection

● The unique design can realize the relay of any combination of RS422-RS422, RS422/485, RS485-RS485

● Power input: 9-30VDC; 2.2W (MAX)

● Operating temperature: -25°C~75°C

● Storage temperature: -25°C~80°C ● Relative humidity: 5-95%, no condensation

A text to understand the difference between RS485 and ARINC485

Rs485 interface understanding

(1) 485 Communication Interface A hardware description of the communication interface. It only requires two communication lines, that is, data transmission between two or more devices. This data transmission connection is a half-duplex communication method. At a certain moment, a device can only send data or receive data.

(2) After the hardware communication interface is established, a data protocol needs to be agreed between the instruments for data transmission so that the receiver can parse the received data. This is the concept of “protocol”.

(3) The communication protocol has a unified standard protocol format, such as the "ModBus" protocol. The content of the standard protocol is comprehensive and contains many contents, but it is difficult to understand. From this, it is possible to define a protocol that is simple and practical, which is the "custom protocol."

(4) Including ModBus protocol and custom protocol. Gas turbines are compatible with two protocol formats.

A text to understand the difference between RS485 and ARINC485

Difference between ARINC485 and RS485

The difference between ARINC485 and RS485 can be summarized as follows:

1.data format is different

The ARINC 485 category defines three styles, each of which defines the protocol format and specifies the use case and transmission rules. The RS485 protocol can be set by the user without any restrictions. (Experience value: The header of the packet header should not overlap with the data content. It is necessary to determine the range of data and possible characters to avoid.) The specific format searches ARINC485 format by itself.

2. Different occasions

This is the most important point. RS485 is used in ordinary communications and industrial sites. The ARINC485 as an on-board bus has strict requirements on the application.

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