Chapter 5: Using Virtual COM

5. Using Virtual COM

Virtual COM driver mode for windows converts COM data to LAN data to control the RS-232 port on an LES301A via the LAN. By creating virtual COM ports on the PC, the Virtual COM driver redirects the communications from the virtual COM ports to an IP address and port number on an LES301A that connects the serial line device to the network. Figure 5-1 shows the Virtual COM connection diagram.

PC

Physical COM1

Physical COM2

COM3 (Virtual COM port) COM4 (Virtual COM port) COM5 (Virtual COM port) COM6 (Virtual COM port) OS Driver Level:

COM 256 (Virtual COM port)

TCP/IP

network

Hub

Serial Line

Serial Device 1

Serial Line

Serial Device 2

Serial Line

Serial Device 3

Serial Line

LES301A

units

Serial Device 4

Figure 5-1. Virtual COM connection diagram.

5.1 Setup of a Virtual COM Driver

5.1.1 Pre-installation Requirements

The PC’s operating system should comply with the following requirements:

Processor: Intel® compatible, Pentium® class

Operating system: Windows® Server 2003, Windows XP, Windows 2000®, Windows NT 4.0 SP5 or later, Windows Me, Windows 98, Windows 95, Microsoft® NT/2000 Terminal Server, Citrix MetaFrame

5.1.2 Supported Firmware

The Virtual COM driver supports firmware AP v3.0 and later of LES301A device servers.

LES301A user manual

724-746-5500 blackbox.com

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Black Box RS-232 Using Virtual COM, Setup of a Virtual COM Driver Pre-installation Requirements, Supported Firmware

RS-422, RS-485, 1-Port 10/100 Device Server, RS-232 specifications

The Black Box IC113C and IC175C are part of a series of versatile RS-485 interface converters designed to facilitate reliable data transmission over long distances. RS-485 is a standard defining the electrical characteristics of drivers and receivers for use in serial communications systems, and these specific Black Box converters exemplify the technology's adaptability and robustness.

The IC113C is an RS-485 to RS-232 converter, providing a seamless transition between these two common serial communication protocols. With a compact design, it boasts an operating temperature range of -40 to 85 degrees Celsius, making it suitable for harsh environmental conditions. Its key feature includes the ability to extend the communication distance up to 4,000 feet, which is ideal for industrial applications where devices may be far apart. Additionally, the IC113C includes built-in surge protection, ensuring that the device can withstand electrical noise and spikes, ultimately increasing the system's reliability.

On the other hand, the Black Box IC175C serves as an RS-485 to USB converter, bridging older serial devices with modern USB interfaces. This converter is critical for users wanting to connect legacy equipment to contemporary computing systems. Featuring a plug-and-play design, the IC175C is easy to install with no external power supply required, as it is powered directly through the USB connection. It also supports data rates up to 115.2 Kbps, ensuring fast and efficient data transfer.

Both models employ differential signaling, which enhances noise immunity and allows for greater transmission distances compared to single-ended communication standards. Furthermore, the converters support multiple nodes on the same bus, accommodating a network of devices without requiring complex wiring schemes.

In summary, the Black Box IC113C and IC175C offer essential features that cater to diverse industrial and commercial applications. With their robust construction, extensive operating ranges, and compatibility with various communication protocols, these converters enhance system interoperability and provide durable solutions for long-distance data communication needs. Whether connecting legacy systems or extending communication capabilities, these devices exemplify reliability and efficiency in modern data transmission technologies.