MCU TTL To RS485 Module

Features Of This Module:

1. We guarantee that all chips are brand new imported industrial-grade chips, and the ultra-long distance transmission can reach thousands of meters.

2. ESD protection with plus or minus 15KV

3. The chip has a limited slew rate driver to reduce EMI and reduce signal reflection caused by improperly terminated cables, so that the error-free signal transmission rate is as high as 500Kbps.

4. The input impedance of the receiver with 1/4 unit load supports multi-machine communication, allowing it to be connected to the bus of no more than 128 devices.

5. The working temperature of industrial chips can reach -40℃ to +85℃.

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

7. The power supply uses patch tantalum electrolytic capacitors, and uses double capacitors for high and low frequency power supply filtering

8. Using dual transient suppression diodes, excellent overvoltage protection performance

9. Use 10Ω current protection resistor, SMD design to improve 485 signal integrity

10. With terminals and welding lead holes, it is convenient for debugging and finalized wiring, and welding leads can improve signal reliability

11. All RS485 and TTL signals are routed on one side to ensure signal quality and improve signal integrity

12. Large area of copper to prevent signal interference

13. It has 2.54 pitch hole board welding holes, which is convenient for your secondary development

14. With M3 screw holes which are quite commonly used at present, the installation is convenient and reliable

15. With 120Ω termination resistance, shorting R16 can enable the termination resistance

16. With power and RXD, TXD signal indicators, you can see the sending and receiving status

17. The angled pins are drawn out, which is convenient for testing

18. Support 3.3V and 5V signal control, strong compatibility

It is well known that the flow control of 485 signals is very difficult to program, especially in some cases where the communication data protocol is unknown, you do not know the amount of data per packet and you do not know when to switch the direction of sending and receiving, then you can choose our 485 automatic flow control module to solve the above troubles. The protection function of this module is beyond the value for money. You can compare it with other 485 control modules and you will find that the design of this module is reasonable and worthwhile.

The TTL to 485 automatic flow direction control module introduced by our store, this module uses MAXIM's 485 chip with integrated automatic sending and receiving function, and never uses an external automatic control chip, to ensure that each is a new original chip, which is safer and more reliable than other automatic flow direction control methods.

This module is designed and produced by the company's working hardware engineers based on rich experience in actual product development, and each module is strictly tested to ensure that it supports 500Kbps baud rate and below (Shenma's current mainstream 2400bps, 4800bps, 9600bps , 19200bps, 38400bps, 57600bps, 115200bps, 128000bps, 256000bps, etc. all independently identify and automatically select the appropriate communication rate mode), and never use an external control chip.

At the beginning of the design of this module, the application in harsh environments is considered, so the signal integrity and EMC characteristics of the module are improved. This chip has been used in regular industrial products, so the performance is very reliable.

It is recommended to use 5V power supply for the module (because the 485 signal level range is 2-6V, so the long-distance reliability of 3.3V power supply is reduced), both 3.3V and 5V signal control can be used (note: the power supply uses 5V, the signal uses 3.3V support, We have done signal protection, please rest assured)

If you have strict signal requirements, please use this module. This module has the function of automatic flow direction control of 500Kbps baud rate, and it will automatically recognize when the baud rate is lower than 500Kbps without human intervention.