Description

1.Description:

 It is a TTL to RS485 module.This module adopts 485 type chip with integrated automatic flow direction,which has higher reliability.

2.Feature:

 1).The module adopts industrial-grade chips,and the ultra-long distance transmission can reach thousands of meters.

 2).It has ESD protection of plus or minus 15KV.

 3).The chip has a limited slew rate driver,which effectively reduces EMI and reduces the signal reflection caused by improper termination of the matching cable,so that the error-free signal transmission rate is as high as 500Kbps.

 4).It has a receiver input impedance of 1/4 unit load,supports multi-machine communication,and allows it to be connected to a bus of 128 devices.

 5).This module can be hot-swapped,and there will be no signal lockout phenomenon that occurs when other 485 chips are hot-swapped.

 6).The power supply uses chip tantalum electrolytic capacitors,and uses double capacitors for high and low frequency power supply filtering.

 7).It uses dual TVS diodes with overvoltage protection.

 8).It uses a 10ohm current protection resistor,and the SMD design improves the 485 signal integrity.

 9).It has terminals and welding lead holes,which is convenient for debugging and finalized wiring,and welding leads can improve signal reliability.

 10).The module is covered with copper on a large area to prevent signal interference.

 11).It has 2.54 pitch perforated board welding holes.

 12).It has M3 screw holes for fixing the module.

 13).It has a 120ohm termination resistor,which can be enabled by shorting R16.

 14).It has power and RXD,TXD signal indication

 15).It supports 3.3V and 5V signal control,with stronger compatibility.

3.Parameter:

 1).Product Name:TTL to RS485 module

 2).Signal Control:3.3V/5V

 3).Chip:485 chip

 4).Input Signal:TTL serial port

 5).Output Signal:485 serial port

 6).Work Temperature:-25℃~85℃

 7).Work Humidity:5%~95%RH

 8).Size:53*21.62*15mm

4.Package:

 1).1pc TTL to RS485 module