Difference between revisions of "TTL 485 PLUS"
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Yousimaier17 (talk | contribs) (Created page with "{{Product |images=400px |categories= {{Category|UART}} {{Category|RS485}} |brand=Diustou |features= * Supports data conversion between UART...") |
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* [[RS232 TTL]] | * [[RS232 TTL]] | ||
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* [[USB TTL PLUS]] | * [[USB TTL PLUS]] | ||
* [[USB 232 PLUS]] | * [[USB 232 PLUS]] | ||
Revision as of 15:51, 5 February 2025
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Contents
Product Features
- Adopts original SP3485 for high-speed, stable, reliable, and compatible communication.
- The module enables mutual conversion between TTL and RS485 signals without the need for "receive-transmit" control, making it as simple to use as operating a serial port.
- Equipped with 5.08mm plug-and-play terminal blocks for smooth and secure connections.
- The circuit operates on a 5V power supply, with TTL signal output at 5V (same as the supply voltage) and input signal level at 5V (compatible with 3.3V signal input).
- Power must be connected to the TTL terminal when in use.
- Features independent power and signal isolation circuits.
- The TTL terminal is equipped with overcurrent and surge protection functions to ensure stable current and voltage output and strong impact resistance.
- The RS485 terminal includes overcurrent protection, surge protection, and lightning gas discharge protection circuits.
- The board has reserved 120R termination resistor pads to enhance signal transmission stability and reduce interference.
- Baud rate support range: up to 2Mbps (in practical applications, the baud rate supported by this module is limited by the baud rates supported by the connected devices on both ends and needs to be adjusted based on actual conditions).
- Three on-board LED indicators for monitoring the circuit's signal transmission and reception status.
- PWR light: green, power indicator
- TXD light: white, TTL data transmission indicator (data flow: RS485 -> TTL)
- RXD light: white, TTL data reception indicator (data flow: TTL -> RS485)
Testing Method
- Connect a USB-to-TTL serial module to the TTL port of the TTL 485 PLUS module.
- TXD - RXD
- RXD - TXD
- GND - GND
- Connect a USB-to-485 serial module to the 485 port of the TTL 485 PLUS module.
- A to A
- B to B
- Connect power to the TTL terminal of the TTL 485 PLUS module.
- 5V - 5V
- GND - GND
- Connect the USB-to-TTL serial module and the USB-to-485 serial module to a computer, open two serial port debugging assistants, and select the corresponding port numbers.
- Use one of the serial port debugging assistants to send data to the TTL 485 PLUS and observe if the receiving window of the other assistant receives the same data as the sending end. If the data is the same, repeat the operation in reverse.
Hardware Connection
Notes
- Power must be connected to the TTL terminal, and the power GND should be connected to the GND of the module's TTL terminal and the GND of the TTL device.
- This transparent transmission module enables mutual conversion between TTL and RS485 signals, but RS485 is a half-duplex communication, which allows bidirectional communication but not simultaneously in both directions. It must alternate between transmitting and receiving. Even if UART is full-duplex communication, it cannot transmit and receive simultaneously; that is, each end of the communication channel can be both a transmitting and receiving end, but information can only flow in one direction at a time.
- Fully consider the lightning protection and anti-interference design of the 485 bus. When transmitting over long distances in the field, connecting the module's "ground" terminal to the earth can provide excellent anti-interference and lightning protection, making the 485 bus safer. For short-distance transmission indoors, grounding is not necessary.
Data Sheet
Resource Download
FAQ
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