USR-TCP232-30x Series User Manual
1. Introduction
1.1. Overview
USR-TCP232-302, USR-TCP232-304 and USR-TCP232-306 are cost-effective serial to Ethernet converter. They
adopt Cortex-M0 solution, which has a main frequency up to 48MHz, providing fast transmission speed.
Equipped with RS232/RS485/RS422 serial port and 10/100M Ethernet port, those products can connect to variety
of serial devices to achieve transparent transmission via simple configuration to save manpower and shorten the
development cycle. These products are widely used in smart traffic, unattended Weighing, manufacturing
industry etc.
USR-TCP232-302, 304 and 306 are identical in software features, they both support transparent data
transmission, Modbus gateway, user-defined webpage, heartbeat packet, registration packet, index function etc.
In hardware, TCP232-302 is RS232 to Ethernet converter, TCP232-304 is RS485 to Ethernet, TCP232-306
supports RS485/RS232/RS422, but RS485/RS232/RS422 can’t work at the same time.
Table 1. Ordering Guide
1 x RS232, DB9 female, DC 5.5*2.1 power supply: 5~7 V
1 x RS485, 3P connector, DC 5.5*2.1 power supply: 5~7 V
1 x RS232/485/422, 4P connector + DB9 male, DC 5.5*2.1 & block terminal power
supply:5 ~ 36V
1.2. Features
• ARM core, Cortex-M0 solution, equipped with deeply optimized TCP/IP protocol stack. It has low latency
and strong scalability, stable and reliable.
• Supports custom webpage function to help users improve brand influence.
• 1.5KV built-in network Magnetic Isolation.
• Wide baud rate: 600~460.8 Kbps, multiple parity bit: NONE, Odd, Even, Space, Mark
• Supports Modbus RTU to Modbus TCP protocol conversion and multi-host polling.
• Supports keepalive mechanism to quickly detect the dead connections and reconnect.
• Supports hardware and software watchdog, automatically restarts when the device goes down.
• 10/100Mbps Ethernet port and support Auto MDI/MDIX.
• Supports a wide industrial operating temperature, -25℃~75℃.
• Versatile operation modes: TCP Server, TCP Client, UDP, HTTP client.
• Support virtual COM, COM Port Redirector USR-VCOM (windows).
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