Do you want to learn how to convert RS-232 signaling to RS-485 signaling?
RS-232 is a widely used interface. One example is the serial port (COM port) of a PC. One drawback is that it can only support short distance communication (up to 50 ft). Some industrial applications need to extend the distance with robust communication. Converting RS-232 to RS-485 is one of the options, since RS-485 is widely used in industrial applications for long distance transmission.
Here is a reference design that implements the conversion circuit via an RS-232 transceiver, an RS-485 transceiver, a digital isolator, and a multivibrator. The industrial-level ESD protection is also included.
Reference Design for RS232 to RS485 Converter
This reference design provides a circuit of converting RS-232 signaling to RS-485 signaling. This allows for long-distance communication since the range supported by RS-232 is normally less than 50 feet while the range for RS-485’s can exceed 1000 feet. The design implements bidirectional half-duplex communication without any software interference.
- Convert RS-232 to RS-485 signaling for bidirectional half-duplex communication without any software interference with hot plug-in feature
- Low voltage design. The design works with both 3.3-V and 5-V supply
- Industrial-level ESD protection
RS-232 port: IEC 61000-4-2, ±8 kV contact, ±15 kV air
RS-485 port: IEC 61000-4-2, ±30 kV contact, ±30 kV air; EFT, IEC 61000-4-4, 50 A; Surge, IEC 61000-4-5, 19 A; Isolation: 5000 Vrms isolation protection
- Extend system topology from point-to-point to multi-drop
- Cable length up to 1000 ft
- Point of sale
- Factory automation
- IP network cameras