Serial port server RS232 / 485/422 turn Ethernet serial port RJ45 Modbus TCP/ RTU mutual transfer

StarTech 1 Port RS232 Serial Over IP Ethernet Device Server, 115.2Kbps Maximum Data Transfer Rate, DB-9 (9 Pin; D-Sub) Male/RJ-45 Female Connectors, Beige

Axxon 1 Port Native PCI Express (PCI) RS232/422/485 Serial Host Adapter

StarTech 2 Port USB to RS232/422/485 Serial Adapter with COM Retention, Gray

Axxon 1 Port Native PCI Express (PCI) RS232/422/485 Serial Host Adapter

StarTech 2 Port USB to RS232/422/485 Serial Adapter with COM Retention, Gray

StarTech 1 Port RS232 Serial Over IP Ethernet Device Server, Beige

Tickas 8CH RS485 Relay Modbus RTU Protocol Serial Port Remote Control Switch for PLC Control Board

Aten UC2322 2-Port USB to Serial RS-422/485 Hub

ESTINK PLC Communication LED Display PLC Display LED Serial Port Meter Communication 4‑Digit DC5‑36V For MODBUS‑RTU RS485

Axxon Native PCI Express (PCIe) 2 Port RS232 Serial Card Adapter (QNX Compliant)

Axxon EPP/ECP Parallel Port + RS232 Serial PCI Express Controller Card

Axxon 2 Port Native PCI Express (PCIe) RS232 Serial Card Adapter with 12" Cable (DB25M to 2x DB9M)

Axxon 2 Port EPP/ECP Parallel Port + Dual RS232 Serial PCI Express Controller Card

Axxon Native PCI Express (PCIe) 2 Port RS232 Serial Card Adapter (Linux/Windows/VMWare)

StarTech 1 Port Low Profile Native RS232 PCI Express Serial Card with 16550 UART

Axxon Native PCI Express (PCIe) 1 Port RS232 Serial Card Adapter with DMA

HF2211 Industrial Modbus Serial R 32/RS485/RS422 WiFi/Ethernet Converter Module

Axxon PCI / PCI-X 133 MHz Dual RS232 (921kbps) Serial Port + 1 Parallel Port Adapter with 36" Cable (HD44M to 2x DB9M + DB25F)

Axxon 1 Port USB to 4 Ports RS232 Serial Adapter with 36" Quadplex Cable (HD44M to 4x DB9M)

Axxon Native PCI Express 2 Port RS232 Serial Card Adapter

Axxon PCI Express (PCIe) 2 Port RS232 Serial Card Adapter with 36" Dualplex Cable (DB25M to 2xDB9M)

Tera Grand 6' Premium USB 2.0 - RS232 Serial DB9 Adapter Cable, Male Thumbscrews

ClearOne 1' DB9 RS232 Serial Female to Phoenix Euroblock Adapter for CONVERGE Pro 2 Touch Panel Controller

Marshall Electronics USB to RS-485/RS-422 Converter

Tera Grand 3' Premium USB 2.0 - RS232 Serial DB9 Adapter Cable, Female Jack Nuts

iOptron RS232 to RJ9 Serial Cable

StarTech 10/100Mbps Ethernet to USB 2.0 Network LPR Print Server

Tera Grand 6' Premium USB 2.0 - RS232 Serial DB9 Adapter Cable, Female Jack Nuts

Hall Research USB-RS232-1 USB to RS-232 Serial Converter for PC and Notebook

KanexPro 6' USB-A to DB9 RS232 Serial Adapter