Connecting the EtherWind to an RS-232 Serial Device

Note: Skip this section if you are not using the EtherWind serial port.

The EtherWind has one standard PC-compatible 9-pin female D-connectors. The serial port uses PC-compatible 9-pin male D-connectors. Note that the standard off-the-shelf 9-pin female to 25-pin male PC cables will require a null modem in order to connect to most printers or terminals. The pin-outs are as follows:

DB9

 

 

DTE

DCE

pin

Signal

Signal

pin

pin

1

Not used

Not used

-

-

2

Receive Data

Transmit Data

2

3

3

Transmit Data

Receive Data

3

2

4

DTR out

DSR in

6

20

5

Signal Ground

Signal Ground

7

7

6

DSR in

DTR out

20

6

7

RTS out

CTS in

5

4

8

CTS in

RTS out

4

5

9

Not used

Not used

-

-

Basically, the cable must connect input signals (e.g., Receive Data) on the TROY EtherWind to the equivalent output signals (e.g., Transmit Data) on the device and vice-versa.

The serial port can be set to operate in console mode to allow you to configure and diagnose the EtherWind via a serial terminal (or PC with a terminal emula- tion program). To enable the console mode manually, unplug the power supply from the serial server, hold down the Test switch and simultaneously plug in the power supply.

The port will remain in console mode until the unit is power off.

You may also nable console mode by connecting remotely to the EtherWind via WebXAdmin, TELNET, NCP, or XConfig (refer to Chapter 3 for information on how to use these utilities). With WebXAdmin, select Configure Port from the main menu, click on serial port S1, select Console Mode, and click Submit. With TELNET or XCONFIG, use the following command:

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TROY Group 802.11b manual Connecting the EtherWind to an RS-232 Serial Device, DB9 DTE DCE

802.11b specifications

TROY Group 802.11b is a significant advancement in wireless networking technology, introduced in the late 1990s. Operating within the 2.4 GHz frequency band, 802.11b provided users with robust connectivity and established a foundation for future wireless standards. This protocol marked a transition from wired networking to wireless, enabling greater mobility and flexibility for users.

One of the main features of the 802.11b standard is its data transmission rate, which supports speeds of up to 11 Mbps. While this may seem modest by today’s standards, it was a groundbreaking achievement at the time. The 802.11b technology utilized Direct Sequence Spread Spectrum (DSSS) modulation, which allowed multiple data streams to coexist with minimal interference. This was crucial in environments with numerous wireless devices.

Security was another important consideration, and 802.11b incorporated Wired Equivalent Privacy (WEP) for data protection. WEP attempted to secure wireless transmissions by encrypting data packets, although it was later found to have vulnerabilities. Nevertheless, it was a starting point for securing wireless communication until more robust security protocols, such as WPA and WPA2, were developed.

The compatibility of 802.11b with earlier standards like 802.11 meant that devices could be mixed and matched, allowing for a smooth transition to wireless networks. With a typical range of around 100 to 300 feet, it was suitable for various environments, from homes to offices. In addition, the protocol facilitated peer-to-peer networking, allowing devices to communicate directly without the need for an access point.

In terms of hardware, 802.11b required compatible wireless network interface cards (NICs) and access points. These devices were increasingly integrated into laptops and desktops, leading to widespread adoption and the growing popularity of wireless networking in everyday life.

In conclusion, TROY Group 802.11b laid the groundwork for modern wireless communication. Its features, including data rates of up to 11 Mbps, DSSS modulation, and initial security measures like WEP, made it a pioneer in the industry. Although it has been succeeded by faster and more secure protocols, the legacy of 802.11b lives on as a crucial development in the evolution of wireless technology, setting the stage for the high-speed and secure connections that users enjoy today.