Converter USB - RS485, CH340

Product detailed description

EIA-485 (originally RS-485 or RS485) is a serial communication standard defined in 1983 by the EIA. It is mainly used in industrial environments. The RS-485 standard is designed to provide a two-wire, half-duplex, multipoint serial link. It has the same basis as the RS-232 standard, from which it differs mainly by a different definition of voltage levels, the absence of modem signals, the possibility of creating networks (or buses) consisting of up to 32 devices and the possibility of communication over a distance of up to 1,200 m (compared to 20 m for RS-232). Another advantage is that an RS-485 line can be created from the widely used RS-232 standard using simple level converters.

Two-wire version of RS-485

The term RS-485 most often refers to the "two-wire" version of RS-485. The transmission is semi-duplex and therefore data transmission control (direction of communication) is required. Using a two-wire RS-485 line, it is possible to create a communication bus to which up to 32 devices can be connected without a repeater. In order for at most one device to transmit at a time, it must provide a communication protocol, which is not part of the RS-485 standard. The simplest option is a configuration with one permanently attached transmitter and up to 31 receivers. In the usual topology, the devices alternate in transmission.

Specifications:

• Chip used: CH340
• Output voltage: 5V
• Cable length: approx. 94cm
• Description of wires: red wire: +5 V, black wire: GND, green wire: RS485 - A, white wire: RS485 - B
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Included in delivery:

• 1pc USB to RS485 converter, CH340

Remark:

• This product is not a standalone functional unit and may require professional installation.
• Product images are for illustration purposes only and may sometimes differ from the actual appearance of the item. However, this does not change its basic properties.