General
Ethernet interface	10 or 100 Mbps
Serial baud rate	1200 bps to 230 kbps
Data bits (serial)	7, 8
Data parity (serial)	none, even, odd, mark, space
Flow control (serial)	None; software: Xon/Xoff; hardware: RTS/CTS
Stop bits (serial)	1, 2
ESD protection (serial)	15 kV
Standard	IEEE 802.3
Software protocol support	ICMP, TCP (UDP)/IP, DHCP client, SNMP, HTTP, Telnet
Current supply	9–30 VDC
Power consumption	max. 1.5 W
Serial connection	DB9 M
Ethernet connection	RJ-45
Operation temperature	0 to 60 °C

The BlackBox LES301A is a 1-port device server that enables the connection of a serial device to an Ethernet network. It serves as a gateway between serial RS-232, RS-422, or RS-485 devices and a 10/100-Mbps LAN, enabling remote communication with industrial devices. The serial communication modes are software-selectable, allowing the server to be flexibly adapted to different requirements. Data transmission occurs bidirectionally and in full-duplex mode, ensuring simultaneous communication in both directions. The server is designed for use in manufacturing, process, and automation applications, for example, for controlling barcode scanners, PLC systems, or Kanban devices in the factory hall.

Applications

The LES301A is suitable for industrial environments where serial devices need to be accessed via an existing or new Ethernet network. It enables remote monitoring, control, and management of field devices without requiring physical access. Connection is made via a serial interface (DB9-M) and an Ethernet port (RJ-45), making integration into existing networks simple and quick. Support for TCP server, TCP client, and UDP modes expands the range of applications, particularly in scenarios where data needs to be transmitted between two serial end devices over the network (serial tunneling function). However, multiple units are required for TCP client and tunneling modes.

Functions and Features in Detail

The device server can be configured via various interfaces: web browser, serial console, Telnet, or a Windows utility program. The included virtual communication software enables the use of existing Windows applications via virtual COM port assignment, simplifying integration into existing software environments. The serial interface supports baud rates from 1200 bps to 230 kbps, data bits 7 or 8, parities (none, even, odd, mark, space), flow control (none, Xon/Xoff, RTS/CTS), and 1 or 2 stop bits. The serial side is equipped with 15-kV ESD protection to safeguard the device against electrostatic discharges.

Technology Explained Simply

The device server encapsulates serial data into IP packets and transports them over the Ethernet network. The Ethernet interface operates at 10 or 100 Mbps and features Auto MDI/MDI-X, allowing the port to automatically adapt to the connection. Communication follows the IEEE 802.3 standard. Software protocol support includes ICMP, TCP/UDP/IP, DHCP client, SNMP, HTTP, and Telnet, ensuring flexible network integration. Power supply is via a separate DC input (9–30 VDC), with the server consuming a maximum of 1.5 W. A redundant dual DC input is supported to ensure uninterrupted operation.

Compatibility and Accessories

The LES301A is compatible with serial devices supporting RS-232, RS-422, or RS-485. The serial interface is implemented via a DB9-M connector, which can be switched between mode variants via software. The Ethernet interface is implemented via an RJ-45 connector and supports 10BASE-TX/100BASE-T. Firmware can be updated over the Ethernet network from a remote PC, simplifying maintenance and servicing during operation.

Mounting and Installation

The device features a robust, compact metal housing that can be mounted either on a wall or on a DIN rail. The required mounting components are included in the delivery scope. The operating temperature ranges from 0 to 60 °C, making the server suitable for use in industrial environments.

Advantages in Operation

The LES301A offers a cost-effective and reliable solution for integrating serial devices into Ethernet networks. Easy configuration via multiple interfaces and support for virtual COM ports simplify integration into existing systems. Support for multiple communication modes (TCP server, TCP client, UDP, tunneling) expands application possibilities. ESD protection and robust construction increase reliability in industrial use. The firmware upgrade function over Ethernet enables centralized maintenance and reduces downtime.