USB to RS485 RS422 RS232 Adapter – 3-Protocol, 1200m, 256 Devices | DTECH DT-5019C

The USB to RS485 RS422 RS232 adapter DT-5019C from DTECH adds three industrial serial protocols to any USB 2.0 port through a single cable, available in 0.5m, 1m or 1.5m lengths. Unlike USB-to-RS232 cables that handle only one legacy serial standard, the DT-5019C covers RS485, RS422 and RS232 simultaneously — making it the practical choice for engineers, system integrators and field technicians who regularly work across multiple industrial serial standards without wanting to carry three separate adapters. Three LED indicators (Power, TXD, RXD) make the transmission state immediately visible during setup and debugging, while the 28/24AWG multi-layer shielded cable construction ensures signal integrity across all supported baud rates and distances.

USB to RS485 RS422 RS232 Adapter — Auto Protocol Switching and Zero-Delay Direction Control

The DT-5019C uses an automatic I/O circuit to control RS485/RS422 data flow direction without requiring any handshake signals such as RTS or DTR, and without jumper settings. Protocol mode conversion between RS232, RS485 and RS422 is handled entirely by the adapter’s built-in logic — existing communication software and interface hardware do not need to be reconfigured when switching between protocols. Auto baud rate detection means the adapter automatically matches the baud rate of the connected serial device; no manual configuration is required on the USB side. Zero-delay automatic transmission and conversion ensures data passes without introducing latency, which is critical for time-sensitive industrial control tasks including PLC programming, building automation, Modbus RTU bus polling, SCADA data acquisition and energy meter reading. The RS485/RS422 channel operates at 300bps to 3Mbps; the RS232 channel at 300bps to 115200bps — the DT-5019C operates in full compliance with the TIA-485 standard for RS-485 serial communications as maintained by the Telecommunications Industry Association.

Point-to-Multipoint RS485/RS422 — Up to 256 Devices and 1200m Distance

The RS485 and RS422 channels support point-to-multipoint operation, allowing a single DT-5019C to communicate with up to 256 RS485/RS422 interface devices on the same bus — sensors, actuators, motor drives, power meters, PLCs and building management field devices can all share one cable run. The maximum supported communication distance on the RS485/RS422 side is 1200m, far exceeding RS232’s practical effective range of approximately 15m. RS232, by contrast, operates point-to-point: one device per connection, suitable for legacy serial equipment, CNC controllers, barcode scanners and any device requiring a direct serial link rather than a shared bus. Having all three protocols in one adapter means the DT-5019C covers both the long-distance, multi-node industrial bus use case (RS485/RS422) and the short-haul, device-to-device legacy connection use case (RS232) from a single stock item.

Three LED Indicators and Industrial-Grade Cable Construction

The three built-in LED indicators give instant operating state feedback: the power LED confirms the adapter is active and enumerated by the host, while dedicated TXD and RXD LEDs illuminate during data transmission and reception respectively — eliminating guesswork during field commissioning and line-fault diagnosis. The cable uses 28/24AWG thick tin-plated copper conductors with multi-layer shielding to suppress electromagnetic interference in industrial environments where variable-speed drives, switching power supplies, relay coils and high-current equipment generate significant electrical noise. The industrial-grade wire construction makes the DT-5019C suitable for permanently routed panel cabinet installations as well as portable field use.

OS Support and Applications

The DT-5019C installs as a virtual COM port on Windows XP, 7, 8 and 10, macOS and Linux (kernel versions below 4.0). Once installed, it is recognised by any serial terminal application, PLC programming software, SCADA client or industrial configuration tool that addresses a standard COM port. Typical applications include Modbus RTU polling over RS485 field bus networks, RS422 point-to-multipoint sensor arrays, PLC programming and live monitoring, BMS device commissioning, serial SCADA data acquisition, legacy RS232 device management and serial port debugging in industrial R&D and QA environments.

For USB-to-RS232-only cables with DB9 connector and FTDI chip, see the DTECH DT-5011 USB to RS232 serial cable. Browse the full industrial serial product category at bam.ae for RS232, RS485, RS422 and TTL serial adapters.

Specifications Table