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CHAPTER 6

SERIAL APPLICATIONS

Revised: 23 Jan 08 6-1 EST P/N AA107G

The ESTeem 195Eg is now available with an optional factory installed serial port that can provide RS-232 communication between

two or more serial devices using the wireless broadband link. The serial data is encapsulated and transferred as a standard Ethernet

packet over an operating 195Eg wireless Ethernet system. The configuration for a serial 195Eg network will be the same as an

Ethernet or a serial (RS-232) based communication network.

The serial interface option can be used to link two or more serial devices in a new or existing system. The serial data has very little

impact on the network bandwidth and will allow for both Ethernet and serial applications simultaneously. A few possible

applications would be installation of the 195Eg in an existing serial based network that was looking for future upgrade to an

Ethernet based system. Another would be using the high-bandwidth Ethernet connections to provide a link to remote video

hardware but also provide a serial link to the existing PLC in a SCADA type application.

SERIAL CONNECTIONS

The RJ-45 serial data port is the far-left port on face of the

195Eg (Figure 1). Using the ESTeem AA0621 interface

cable, the 195Eg can be connected to a standard DTE-device

(PC) with a male 9-pin Sub-D connector. The complete

cable configuration is available in Appendix C – Interface

Ports.

Second Ethernet Port

Installation of the serial option also includes installing a

second 10/100 Base-T Ethernet interface. This second

Ethernet port can be used to Bridge to the first Ethernet port

(ETH_0) and the wireless link to work as a two-port HUB

when configured in the AP Bridge mode. This second Ethernet port can also be configured as Router port between the wireless and

the first Ethernet port in AP Router mode (Figure 2).

AP Bridge Mode

In the AP Bridge mode, both Ethernet ports (ETH_0 and ETH_1) and the wireless port (WLAN_0) are configured for a common

subnet and share a common IP address.

AP Router Mode

In the AP Router mode, the two Ethernet ports (ETH_0 and ETH_1) will be on separate subnets. The primary Ethernet port

(ETH_0) is configured for Subnet A. The secondary Ethernet port (ETH_1) is bridged to the Wireless port (WLAN_0), sharing an

IP address and configured for Subnet B.

If desired, the secondary Ethernet Port (ETH_1) can be configured for a 3rd subnet (i.e. subnet C). This requires advanced

configuration and routing tables specific to the particular networks.

12 VDC Input

(Auxiliary

Connector )

Reset Switch

RS-232

Configuration

RJ-45 10/100BaseT

Ethernet Port

Transmit

LED

Receive

LED

Status

LED

Power over

Ethernet LED

Aux Power

LED

RS-232

Data Port

Second

Ethernet

Port

Figure 1: 195Eg Front Panel Overview

Bridge

Ethernet 1

Ethernet 2

Wireless

Router

Ethernet 1

Ethernet 2

Wireless

Subnet 1 Subnet 2

Figure 2: Bridge and Router Configuration for Ethernet Ports

Summary of content (10 pages)

PAGE 1
CHAPTER 6 SERIAL APPLICATIONS The ESTeem 195Eg is now available with an optional factory installed serial port that can provide RS-232 communication between two or more serial devices using the wireless broadband link. The serial data is encapsulated and transferred as a standard Ethernet packet over an operating 195Eg wireless Ethernet system. The configuration for a serial 195Eg network will be the same as an Ethernet or a serial (RS-232) based communication network.
PAGE 2
CHAPTER 6 SERIAL APPLICATIONS Figure 3: Serial Configuration Screen SERIAL CONFIGURATION Configuration of the serial port is completed during the standard setup of the 195Eg. After completion of the Repeater Peer configuration screen, the Serial Port Setup screen (Figure 3) will be displayed.
PAGE 3
CHAPTER 6 SERIAL APPLICATIONS Mode of Operation There are two distinct modes of operation for the serial port in the 195Eg. The Redirector mode will provide two-way serial communication between two or more serial devices, while the Terminal Server mode will allow serial communication to a specific remote site by connecting through telnet or SSH. Select one of the following modes of operation: Full Redirector Mode - This mode allows bi-directional RS-232 data communication with another ESTeem.
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CHAPTER 6 SERIAL APPLICATIONS Li ne -o f -S ig ht th Pa ht ig RS-232 Data Access Point Bridge with Repeater Mode Pa th f-S -o ne Li Access Point Bridge with Repeater Mode Line-of-Sight Path Remote Site RS-232 Data Access Point Bridge with Repeater Mode Remote PLC Access Point Bridge with Repeater Mode RS-232 Data Lin e -ofSig ht P ath Repeater NOTE: Path ight -of-S Line Remote Site & Repeater Repeater may be standalone or attached to a network or device.
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CHAPTER 6 SERIAL APPLICATIONS Flow Control Select the type of data flow control used on the RS-232 connection. The ESTeem can support Hardware flow control (RTS/CTS control lines) or Software Flow Control (XON/XOFF). Select None if no serial flow control is necessary. Maximum Bridge Links for Multicast Packets This value sets the maximum number of Ethernet bridge links that the multicast packets will be sent through when used in a multipoint system.
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CHAPTER 7 REPEATING FEATURES To increase the wireless network’s area of coverage for both indoor and outdoor applications, the ESTeem 195Eg utilizes a custom repeating feature that allows increased coverage areas without the added expense of hard cabling or adding an additional point to point radio link. With a conventional IEEE 802.11g or 802.
PAGE 7
CHAPTER 7 REPEATING FEATURES Finally, enabling the link allows the corresponding 195Eg to be included in the communication routing. Mobile clients do not require input in the repeater peer table. If multiple Mesh routes are configured, you will also need to set the values for Priority and Path Costs (explained in Spanning Tree below). For multiple examples of repeater configurations, please refer to Chapter 5 of this user’s manual.
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CHAPTER 7 REPEATING FEATURES HUB or Switch Stand-Alone Repeater Site Example #2 S/N: E-14002 WLAN MAC= 00:04:3F:00:09:05 10/100BaseT Primary Network Router (Required) Repea Access Point Router with Repeater Feature Enabled Access Point Bridge with Repeater Feature Enabled p ea ep R h at rP te EtherStation Mode Mobile Vehicle Single Ethernet Device Example #4 S/N: 14004 r Path Primary Repeate ku ac B Plant Network Large Wired LAN Example #1 S/N: E-14001 WLAN MAC=00:04:3F:00:09:01 ter Path Remo
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CHAPTER 7 REPEATING FEATURES Path Cost If more than one communication path to the Root Bridge is found, the 195Eg must determine which route to take based upon the lowest Path Cost. The default path cost to all links in the 195Eg network is 100. If the Path Costs are equal then the lowest MAC address will determine the priority route. In the ESTeem Mesh Network we want to directly control all data flow so do not want the routes to be automatically determined.
PAGE 10
CHAPTER 7 REPEATING FEATURES Redundant Backup The ESTeem Model 195Eg configured in Access Point Repeater mode will automatically function as a redundant backup if two Model 195Eg’s are installed at the same location (Figure 7). If two Model 195Eg’s are connected to the same HUB or Switch, one of the Model 195Eg’s will be Blocked when the Spanning Tree Protocol is completed.