This USB 2.0-compatible digital I/O terminal can be connected to a USB interface of a PC to provide input and output digital signals (12 - 24 VDC) easily. It allows input for up to eight channels as well as eight output channels. This unit...
Contact Sales Department for Pricing New Isolated RS-422A/485 4 Channels 921,600 bps 500/1000VAC Isolation USB 2.0 VCCI-A · FCC-A · CE · UKCA 4‑channel isolated RS‑422A/485 serial communication for USB. The COM‑4PDHN‑USB delivers up to 921,600 bps with 500VAC channel‑to‑channel and 1000VAC bus isolation. 128/384 byte FIFO buffers, full/half duplex...
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4‑channel isolated RS‑422A/485 serial communication for USB. The COM‑4PDHN‑USB delivers up to 921,600 bps with 500VAC channel‑to‑channel and 1000VAC bus isolation. 128/384 byte FIFO buffers, full/half duplex selection, and Windows COM port driver. Wide temperature range (-20 to +60°C). From Contec Americas.
The COM‑4PDHN‑USB is a USB2.0 serial communication unit that adds four isolated RS‑422A/485 ports to any PC. With baud rates up to 921,600 bps and 128/384 byte FIFO buffers, it is ideal for industrial automation, SCADA, and long‑distance serial communication. The unit features 500VAC channel‑to‑channel isolation and 1000VAC bus isolation for excellent noise immunity in harsh environments.
Serial Features
4 RS‑422A/485 ports
921,600 bps max
128‑byte Tx / 384‑byte Rx FIFO
Full/half duplex selectable
1200m max communication distance
Isolation & Software
500VAC channel‑to‑channel
1000VAC bus isolation
Windows COM port driver
Win32 API / MSComm support
Diagnostic programs
Isolation and surge protection – 500VAC isolation between channels and 1000VAC bus isolation provide robust protection against electrical noise, ground loops, and surges in industrial environments.
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Built for Industrial Serial Communication
Designed for demanding factory automation, remote device control, and long‑distance serial networks. The COM‑4PDHN‑USB operates across a wide temperature range (-20 to +60°C) and features a compact DIN‑rail mountable design with screw‑type terminal connectors for reliable field wiring.
Wide temperature range – Operates from -20 to +60°C for installation in diverse environments.
Bus and channel isolation – 1000VAC bus isolation and 500VAC channel‑to‑channel isolation.
Flexible mounting – Screw fastening, magnet (option), or DIN rail installation.
Wide power range – 12‑24VDC input with FG terminal for grounding.
LED status indicators – POWER, RxD, and TxD LEDs for clear communication status.
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Full Specifications
Specification
Detail
Model
COM-4PDHN-USB
Number of channels
4 channels
Interface type
RS-422A / RS-485
Isolation
500VAC (channel‑to‑channel), 1000VAC (bus)
Transfer method
Asynchronous serial transfer
Baud rate
300 – 921,600 bps
Data length
7, 8 bits
Stop bits
1, 2
Parity check
Even, Odd, Non‑parity
Controller chip
XR21V1414 (128‑byte Tx / 384‑byte Rx FIFO)
Connecting distance
1200m (typical, depending on baud rate and cable)
USB specification
USB 2.0 / 1.1, Full‑speed (12 Mbps)
Power supply
Self‑powered, 12‑24VDC
Power consumption
12VDC 375mA, 24VDC 190mA (max)
Dimensions (mm)
188.0(W) × 78.0(D) × 30.5(H)
Weight
220g (without cable)
Operating temperature
-20 to +60°C
Operating humidity
10 – 90%RH (no condensation)
Standards
VCCI Class A, FCC Class A, CE (EMC Class A, RoHS)
Included items
Unit, rubber feet (4), 3‑pin power connector, 5‑pin RS‑422A/485 connectors (4), AC cable (1.8m), USB cable (1.8m), USB cable attachment, AC adapter, Setup disk, first step guide, warranty certificate, serial number label
Datasheet version
As of July 2022
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Optional Accessories
Product Name
Model
Description
AC adapter (12VDC 1.0A)
POA201-10-2
Included standard
DIN rail mounting power supply 15W
CPS-PWD-15AW12-01
Input: 100‑240VAC, Output: 12VDC 1.3A
Magnets for installation (4‑piece set)
CPS-MAG01-4
For magnetic mounting
Visit the CONTEC website for the latest optional products.
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Certifications and Compliance
VCCI Class A — Japanese voluntary control for electromagnetic interference (commercial/industrial environments).
FCC Class A — U.S. emissions compliance for industrial use environments.
CE (EMC Directive Class A, RoHS Directive) — European conformity for electromagnetic compatibility and restriction of hazardous substances.
Ready to add isolated 4‑port RS‑422A/485 serial via USB?
The COM‑4PDHN‑USB is available through Contec Americas on a quote basis. Contact our sales team to discuss quantity, accessories, and integration with your industrial serial communication systems.
Tags COM-4PDHN-USBRS-422A USBRS-485 USBIsolated Serial USB4-Port Serial921600 bpsFIFO SerialContec USBIndustrial SerialSCADALong Distance SerialWindows COM DriverFactory AutomationDIN Rail Mount
This USB 2.0-compatible digital I/O terminal can be connected to a USB interface of a PC to provide input and output digital signals (12 - 24 VDC) easily. It allows input for up to eight channels as well as eight output channels. This unit...
