Antaira Technologies’ STM-604C-T series is an industrial MODBUS gateway that allows legacy MODBUS RTU/ASCII devices to operate on a MODBUS TCP network. It can be configured for either MODBUS serial master or slave to communicate with MODBUS TCP’s slave or master. The Antaira STM-604C-T series features two independent Ethernet ports and MAC addresses to provide redundancy and reliability. These devices provide an economical way of connecting MODBUS RTU/ASCII devices to networks accessible anywhere in the world.

STM-604C-T’s Key Features:

• 2*10/100 Mbps Ethernet Ports for LAN Redundancy
• Integrates Modbus TCP and Modbus RTU/ASCII Networks
• Supports Up to 921.6 kbps and Any Baud Rate Setting
• Supports Up to 16 Connections per Serial Port Under Modbus Master Mode and 32
• Sessions Under Modbus Slave Mode
• Software-selectable RS-232/422/485 Communication
• Automatic RS-485 Data Flow Control
• Redundant Power Input: 12~48VDC
• Power Polarity Reverse Protection
• Overload Current Protection
• DIN-Rail or Wall Mountable
• Wide Temperature Model
• 5-Year Warranty

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The STM-501C, MODBUS gateway allows the legacy MODBUS RTU/ASCII devices to operate on a MODBUS TCP network. It allows either MODBUS serial master or slave to communicate with MODBUS TCP’s slave or master. Modbus TCP masters to Modbus RTU/ASCII slaves: The Antaira STM-501C allows multiple MODBUS TCP masters to communicate with a MODBUS serial network. Since a MODBUS serial network can only handle one query at one time, queries from different masters are pipelined and processed one by one. Modbus RTU/ASCII master to Modbus TCP slaves: When the STM-501C functions as the MODBUS RTU/ASCII master to MODBUS TCP slave gateway, the STM-501C can connect up to 8 MODBUS TCP slaves. Users can specify a UID range for each MODBUS TCP slave. Inactive timeout: The STM-501C provides an inactive timeout that allows users to specify a time period to disconnect TCP/IP connection if there is no activity in the network. If the connection does not tear down it would occupy one connection slot and prevent any another connection again. Configuration tools: User friendly management software provides an easy way to configure the STM-501C. It can search all serial device servers within a local area network independent of its subnet. It can also find a serial device server of a specific IP address over a wide area network. The STM-501C can also be configured by its console port or through telnet connection. The STM-501C provides a web interface for the user to configure it with a web browser.

STM-501C’s Key Features:

• DIN-Rail or Panel Mount
• Supports 10/100 Mbps Ethernet
• Supports RS-232, RS-422, and RS-485 Serial Interface
• Supports LAN and WAN Communications
• Management Access Password Protected
• Supports up to 8 MODBUS TCP Master to MODBUS RTU/ASCII
• Supports Inactive Timeout
• Supports Loop Back Mode

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Key Features:

• Rugged Metal Case with DIN-Rail / Wall-Mount
•  15 KV ESD Protection for Serial Signals
•  10/100Mbps Fast Ethernet Full Duplex Auto Negotiation
•  Supports Multiple Link Mode with TCP Server/Client, UDP, and Virtual COM Mode
•  Monitor, Manage, and Control Industrial Field Devices Remotely
•  Configurable via Built-In Web Server, Serial Console, or Telnet
•  Windows Base Utility for IP Configuration
•  Compact Size
•  Upgradeable Firmware from Remote-PC via Ethernet

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