Semiconductor discharge (SIDACtor)
Qualities: fast response, good consistency, lightning residual voltage, junction capacitance <40pF, suitable for ADSL1, ADSL2 high transmission rate application environment.
Description: 1 RS485 bus basic characteristics: According to RS485 standards, RS485 industrial bus to the characteristic impedance of 120 Ω half-duplex communication bus with a maximum load capacity of 32 payload (including the master and controlled equipment). 2 RS485 bus transmission distance: When using 0.56mm (24AWG) twisted ...
1 RS485 bus basic characteristics: According to RS485 standards, RS485 industrial bus for the characteristic impedance of 120 Ω half-duplex communication bus with a maximum load capacity of 32 payload (including the master and controlled equipment).
2 RS485 bus transmission distance: When using 0.56mm (24AWG) twisted pair communication cable, according to different baud rate, the maximum transmission distance of theoretical values ​​are as follows:
Baud rate maximum distance
2400BPS 1800 米
4800BPS 1200 米
9600BPS 800 米
When using smaller communication cable, or strong electromagnetic interference environment using the product, or on the bus with more equipment, the maximum transmission distance is reduced accordingly. Conversely, the maximum distance lengthened.
3 Connection and termination resistance:
3-1 RS485 industrial bus standards between various devices daisy-chain connection, two must be connected to a 120 Ω termination resistors. (Figure) Figure 57 can be used to simplify connection, but the "D" distance should not exceed 7 meters.