How does H6 switch between RS422/RS485 modes?

Overview:
For the H6 series of products, which includes two DB-9pin serial ports by default, the default operating mode is RS232. These two ports support three modes of operation: RS232, RS422, and RS485. Users can choose the koop sildenafil zonder recept in duitsland desired mode according to their needs. The following outlines the method for switching modes.

I. Selecting COM Mode in BIOS:
1-1. Press the power button and amoxil quickly tap the Del key on the keyboard to enter the BIOS. Navigate to Advanced > SIO MISC Configuration. In the COM1 Mode and COM2 Mode settings, users can select their desired operating mode: RS232 (default), RS485, or RS422, based on their requirements.

1-2. When the configuration is complete, press the keyboard F10 key to save and exit.

II. Pin Definitions for RS232, RS485, and RS422: Note: Different operating modes have different pin definitions for the DB-9pin COM ports. Please connect external devices according to the operating mode and pin definitions.

2-1. RS232 is defined as follows:

2-2. RS485 is defined as follows:

2-3. RS422 is defined as follows:

III. Characteristics of RS232, RS485, and RS422:

RS232:

  • Maximum transmission rate: 20kbps
  • Maximum communication distance: 15 meters
  • Transmission requires three wires: RX, TX, and GND
  • When in use, RX needs to be connected to TX in a crossover configuration
  • RS232 uses negative logic levels with a range of ±15V

RS485:

  • Evolved from RS232, RS485 utilizes half-duplex transmission
  • Similar to RS422, it employs balanced transmission
  • Transmission rate: 10Mb/s
  • Communication distance: up to 1200 meters
  • Typically consists of two wires: A (RS485+) and B (RS485-)
  • Uses differential signal negative logic; +2V to +6V represents "0", while -6V to -2V represents "1"

RS422:

  • Defines a balanced communication interface
  • Utilizes twisted pair transmission
  • Transmission rate: 10Mb/s
  • Communication distance: up to 1200 meters
  • RS422 consists of R+, R-, T+, T-, and GND
  • When in use, R+ and T+ form one pair, while R- and T- form another pair

作者： minipc

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