B&B Electronics Vlinx ESP902 Wartungshandbuch PDF herunterladen (Seite 11)

Introduction

Manual Documentation Number: ESP901-902_5012m Chapter 1 3

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Communication Modes

The ESP901 and ESP902 Serial Servers enable communication with

serial devices over a LAN or WAN. Serial devices no longer are

limited to a physical connection to the PC COM port. They can be

installed anywhere on the LAN using TCP/IP or UDP/IP

communications. This allows traditional Windows PC software access

to serial devices anywhere on the LAN/WAN network.

Direct IP Mode

Direct IP connections allow applications using TCP/IP or UDP/IP

socket programs to communicate with the asynchronous serial ports on

the Serial Server. In this type of application the Serial Server is

configured as a TCP or UDP server. The socket program running on the

PC establishes a communication connection with the Serial Server.

The data is sent directly to and from the serial port on the server. When

using UDP protocol the server can be configured to broadcast data to

and receive data from multiple IP addresses.

Virtual COM Mode

Install Virtual COM Mode allows the user to add a driver, to provide a

virtual COM port on the computer. The new COM port shows up in the

Device Manager. Windows programs using standard Windows API

calls are able to interface to virtual COM ports. When a program on the

PC opens the new COM port, it communicates with the remote serial

device connected to one of the ports on the Serial Server.

After connection, the LAN is transparent to the program and serial

device. Applications are able to work just as if the serial device is

connected directly to a physical COM port on the computer. The virtual

COM port software converts the application’s data into IP packets,

sends it across the network to the Serial Server, which converts the IP

packet back to serial data and sends the data out a serial port located on

the Serial Server.

To use this mode, the Serial Server must be set to either TCP/server or

UDP/server with a designated communication port number. The virtual

COM driver is the TCP or UDP client.

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B&B Electronics Vlinx ESP902 Wartungshandbuch Seite 11