Contemporary Controls AI-SRVR User manual

AI-SRVR
ARCNET Server to Ethernet Client
Software Manual
# TD000200-0MB
INDUSTRIAL
CONTROL
EQUIPMENT
®
4EA4

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Trademarks
Contemporary Controls and CTRLink are registered trademarks of Contemporary Control Systems, Inc.
Other product names may be trademarks or registered trademarks of their respective companies.
Copyright
© Copyright 2006, by Contemporary Control Systems, Inc. All rights reserved. No part of this publication
may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language
or computer language, in any form or by any means, electronic, mechanical, magnetic, optical, chemical,
manual, or otherwise, without the prior written permission of:
Contemporary Control Systems, Inc. Tel:[phone]
2431 Curtiss Street Fax:[phone]
Downers Grove, Illinois 60515 USA E-mail:[email protected]
WWW:http://www.ccontrols.com
Contemporary Controls Ltd Tel:[phone]
Sovereign Court Two, UWSP Fax:[phone]
Sir William Lyons Road E-mail:[email protected]
Coventry CV4 7EZ UK WWW:http://www.ccontrols.co.uk
Contemporary Controls GmbH Tel:[phone]
Markt 54 Fax:[phone]
D-06295 Eisleben Deutschland E-mail:[email protected]
WWW:http://www.ccontrols.de
Disclaimer
Contemporary Control Systems, Inc. reserves the right to make changes in the specifications of the
product described within this manual at any time without notice and without obligation of Contemporary
Control Systems, Inc. to notify any person of such revision or change.
WARNING — This is a Class A product as defined in EN55022.
In a domestic environment this product may cause radio interference
in which case the user may be required to take adequate measures.

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1 Table of Contents
1 TABLE OF CONTENTS...........................................................................................3
2HISTORY.................................................................................................................4
3INTRODUCTION......................................................................................................4
3.1 Software............................................................................................................5
3.2 Product Images.................................................................................................6
4OPERATION............................................................................................................7
4.1 General Considerations ....................................................................................7
4.1.1 Functions of Operation..................................................................................7
4.1.2 Configuration.................................................................................................7
4.1.3 LEDs..............................................................................................................7
4.1.4 Access Options .............................................................................................8
4.1.4.1 HyperTerminal ©.................................................................................8
4.1.4.2 Console Port Access ..........................................................................8
4.1.4.3 Telnet Access.....................................................................................8
4.1.4.4 Initial Access by a Telnet Session ......................................................9
4.1.4.5 Web Browser Access (Read Only) ...................................................11
4.2 AI-SRVR Function...........................................................................................12
4.2.1 AI-SRVR Statistics Screen (Read Only)......................................................12
4.2.2 AI-SRVR Configuration................................................................................13
4.3 AI-PROXY Function........................................................................................16
4.3.1 AI-PROXY Statistics Screen (Read Only) ...................................................18
4.3.2 AI-PROXY Configuration.............................................................................19

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2 History
2/1/2005 Initial Release
7/1/2006 Expanded LED and Proxy functionality
3 Introduction
The AI-SRVR employs a CPU (running the Linux operating system) to perform as an
ARCNET Server to an Ethernet Client. There are several models which offer different
transceiver options. The AI-SRVR-1/CXB accommodates coaxial cabling at a data rate
of 2.5 Mbps. The AI-SRVR-1/TB5 has an RJ-45 port for dipulse signals at a rate of 2.5
Mbps. Two other models are designed for EIA-485 signaling — the AI-SRVR-1/485D
accepts DC-coupled signals at all of the common data rates while the AI-SRVR-1/485X
passes AC-coupled signals at three popular data rates.
On the ARCNET side, the unit operates transparently. No changes or protocol overhead
are needed. The unit will appear as just another node within an ARCNET network.
The Ethernet port accepts 10BASE-T or 100BASE-TX signals, continuously monitors
connectivity and supports TCP/IP and UDP protocols. This port supports the PAUSE
function for full-duplex operation and the backpressure scheme for half-duplex data. It
auto-negotiates the port parameters of data rate, duplex mode and flow control.
With the help of incoming packet buffering, multiple Ethernet users can send messages
to any ARCNET node. Complete ARCNET frames are encapsulated.
When communicating from ARCNET to Ethernet, frames are sorted by Source ID and
buffered in 255 FIFO mailboxes. Mailbox “0” is used for broadcast messages. Ethernet
users can receive packets from specific nodes or poll mailbox buffers of specific nodes.
An included function called AI-PROXY allows one ARCNET node to communicate via
an Ethernet backbone link (either wired or wireless) to another ARCNET node in a
completely different LAN. This arrangement requires two units — one in each LAN.
Each unit acts as a local proxy for the represented node situated in the remote LAN.
When using the AI-SRVR function, the unit can be set to accept only messages addressed
to it or all messages from any ARCNET node, regardless of the intended destination.
Configuration can be accomplished in two ways — through an EIA-232 console port
(COM1) connected to a Windows®-based terminal emulation application such as
HyperTerminal®— or through a Telnet session where simple password protection is
provided. A second serial port (COM2) is for factory service only.
The unit is powered from a wide-range, low-voltage AC or DC source — and redundant
power connections are present for backup considerations. It comes with all that is
needed for either DIN-rail or panel mounting. The switch front panel features a general
status LED and there are LEDs for link status, activity, and data rate of each port.

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3.1 Software
The provided CD-ROM contains:
•This Software Manual
•Installation Guide

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AI-SRVR-1/485D
AI-SRVR-8/485D
AI-SRVR-1/485X
AI-SRVR-8/485X
AI-SRVR-1/CXB
AI-SRVR-8/CXB
AI-SRVR-1/TB5
AI-SRVR-8/TB5
3.2 Product Images
Figure 1 — The AI-SRVR Series

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4 Operation
4.1 General Considerations
Configuration is accomplished while the AI-SRVR is connected to a suitable device,
either a computer terminal or a computer running a terminal emulation program such as
HyperTerminal from Microsoft®. The connection is made via the AI-SRVR serial port
(console port) which uses standard EIA-232 protocol.
4.1.1 Functions of Operation
The unit has the following two ways of functioning:
In the AI-SRVR Function, the unit performs as an ARCNET server for delivering
ARCNET packets to one or more Ethernet clients.
In the AI-PROXY Function, an ARCNET node can communicate via an Ethernet
backbone to an ARCNET node in a different LAN. This requires two AI-SRVRs — one
in each ARCNET LAN — each acting as a proxy for the remote node being represented.
4.1.2 Configuration
To avoid communication difficulties, configuration should be accomplished before the
unit is connected to either the ARCNET or Ethernet network. Whether the unit is
configured by a Telnet session or through its console port, the procedure and the
display screens are the same. However, the screens used for the AI-SRVR Function
differ slightly from those displayed for the AI-PROXY Function.
4.1.3 LEDs
Several LEDs aid in monitoring performance and in troubleshooting:
ARCNET: The RX LED glows green when the unit receives
data from the ARCNET LAN.
The ACT LED flashes yellow whenever the unit’s
CPU and ARCNET chip communicate.
Ethernet: The LINK/ACT LED glows if a valid link exists to
an operating Ethernet device and indicates speed
by color: green for 100 Mbps and yellow for 10
Mbps. It flashes to indicate activity.
The DUP LED glows green to indicate full-duplex
operation and yellow for half-duplex.
STATUS: During boot-up, this green LED flashes. Once all
files have loaded — about 15 seconds on newer
units, 50 seconds for older units) — it glows solid
to indicate the unit is operational.

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4.1.4 Access Options
The AI-SRVR can be accessed through its Ethernet port or its console (serial) port.
Initially, the unit must be configured so that its IP address is set to a value placing it on
the same subnet as that in which it is being installed. The simplest way to do this is via
the console port. If a null-modem cable is not available, the unit can also be configured
via its Ethernet port and a Telnet session as described in Section 4.1.4.4.
4.1.4.1 HyperTerminal
©
Later versions of HyperTerminal can connect to the AI-SRVR in either
of two ways:by Telnet or the unit’s console port using a null-modem
cable (not provided). Earlier versions of HyperTerminal did not have
Telnet capability. Once a connection is made, either method of access
involves the same procedure and displays the same screens.
4.1.4.2 Console Port Access
With a serial null-modem cable connected between the unit’s COM1 (DB-9) port and a
computer terminal (or a computer performing terminal emulation), the unit can be
monitored and configured. For proper EIA-232 communication:
•Set the Baud rate to 57600.
•Set the Data bits to 8.
•Set the Parity to None.
•Set the Stop bits to 1.
•Set the Flow control (handshaking) to None.
•Set Emulation to ANSI.
With console port access, no login is required. As soon as the unit boot-up process is
completed and the serial cable is connected, the screen will display the statistics screen
for the most recently used function — AI-SRVR or AI-PROXY.
4.1.4.3 Telnet Access
The AI-SRVR includes a Telnet server. It is factory-programmed with a default IP
address of 192.168.92.68 and a Class C subnet mask of 255.255.255.0. Changing the
IP address is strongly encouraged. Once the AI-SRVR has finished booting and its
Ethernet port has been connected to the Ethernet network, Telnet communications are
possible. However, the AI-SRVR and any computer communicating with it must share
the same subnet. If they are not on the same subnet, they can not communicate.

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A Telnet session requires a login procedure as displayed in Figure 2. The default login
string is “root” and it is echoed on screen. The default Password string is also “root”,
but it is NOT echoed on screen. If the login is successful, a Linux bash prompt is
displayed. From the bash prompt, two commands enable the user to choose the
operational function. These commands are config-srvr and config-proxy.
Figure 2 — Telnet Login Screen
4.1.4.4 Initial Access by a Telnet Session
The hardware arrangement for the initial setting of the IP address via a Telnet session
appears in Figure 3. The computer should be temporarily disconnected from the
Ethernet LAN in case the AI-SRVR default address matches that of another device on
the existing LAN. If it is certain that no existing device on the LAN uses IP address
192.168.92.68, then the computer can remain in the LAN. Otherwise, the procedure for
changing the IP address employs the creation of a temporary LAN composed of nothing
but the AI-SRVR, the computer used to configure it and a CAT5 cable connecting the
computer to the AI-SRVR’s Ethernet port. Consequently, the computer will be
unavailable for normal network functions until this procedure is finished.
Figure 3 — Setup for Initial IP Address Configuration by Telnet

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For initial configuration, the computer chosen for the procedure should temporarily have
its IP address modified as shown in Figure 4 — which uses a Windows 2000 example.
Figure 4 — Changing the IP Address of the Computer Used for Setup
The example in Figure 4 suggests an IP address for the computer of 192.168.92.69, but
the final quad of the address could be any value from 1 to 255 — except for 68 which is
used in the AI-SRVR’s default IP address. After the IP address of the computer has
been set to a value placing it in the same subnet as the AI-SRVR, the computer can
access the AI-SRVR via the unit’s default IP address using either a web browser or a
Telnet session. However, web browser access allows only monitoring — configuration
can only be done via Telnet or through the console port.

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4.1.4.5 Web Browser Access (Read Only)
Although the AI-SRVR must be configured via either its console port (Section 4.1.4.2) or
via a Telnet session (Section 4.1.4.3), statistics can be monitored by a web browser
run from any Internet-capable computer. The AI-SRVR is compatible with recent
versions of Internet Explorer (5.0 or later) or Netscape Navigator (7.1 or later). It is
factory-programmed with a default IP address of 192.168.92.68 and a Class C subnet
mask of 255.255.255.0. Changing the IP address is strongly encouraged. A
sample statistics page appears in Figure 5.
Figure 5 — The AI-SRVR Statistics Web Page

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4.2 AI-SRVR Function
4.2.1 AI-SRVR Statistics Screen (Read Only)
When the AI-SRVR Function is initially invoked, the default AI-SRVR Statistics screen of
Figure 6 appears — presenting information in 8 data fields.
Figure 6 — AI-SRVR Statistics Screen (Read Only)
On the left side of the screen, 5 ETHERNET fields are reported:
IP Address reports the currently assigned IP Address of the AI-SRVR.
Clients lists how many Ethernet clients are connected to the AI-SRVR. Accessing
the unit by web browser temporarily increases this count by one.
RX Packets counts the number of Ethernet packets received by the AI-SRVR.
TX Packets counts the number of Ethernet packets transmitted by the AI-SRVR.
Server Status identifies the AI-SRVR status. If the AI-SRVR software is running
the unit should be ONLINE, otherwise the software is inactive. This could
occur during Telnet access if config-srvr is run while AI-PROXY is active.
Executing config-proxy would then confirm that AI-PROXY is ONLINE.
On the right side of the screen, 3 ARCNET values are reported:
Node ID reports the currently assigned ARCNET node ID of the AI-SRVR.
RX Packets counts the number of ARCNET packets received by the AI-SRVR.
TX Packets counts the number of ARCNET packets transmitted by the AI-SRVR.

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The screen of Figure 6 offers three case-insensitive options:
Rforces an immediate refresh of the screen. Otherwise, the screen refreshes itself
automatically every 10 seconds.
S opens the Setup Screen for configuration (Section 4.2.2).
C resets all 4 packet counters.
Q exits the AI-SRVR program. This option is unavailable when connected to the AI-
SRVR via the COM2 port. This port only allows program monitoring — it does not
allow configuration or program control.
4.2.2 AI-SRVR Configuration
By pressing “S” from the AI-SRVR Statistics Screen, the default AI-SRVR Configuration
Screen of Figure 7 appears to allow control of 16 parameters. All fields in the left column
(except Node ID) are modified by pressing the space bar. These are:
Function should be toggled to the desired mode: SERVER or PROXY.
Boot Protocol is NONE by default, but can be toggled to DHCP.
Speed is 2.5Mbs by default, but can be set from 156kbs to 10Mbs. The
7.5Mbs option is the undocumented "reserved" speed of the
COM20022 — but it is not recommended for use.
Ext Timeout is STD by default, but can be set to 16X, 8X or 4X.
Recon Timeout is STD by default, but can be set to64Nodes, 32Nodes or 16Nodes.
Receive All (promiscuous mode) is ON by default, but can be toggled to OFF.
Figure 7 — AI-SRVR Configuration Screen
Node ID is 1by default, but a value from 1–255 can be entered.

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All fields in the center and right columns of Figure 7 require numerical values:
IP Addr is 192.168.92.68 by default. Defining a new address before
placing the unit into service is highly recommended.
Netmask is the subnet mask — 255.255.255.0 by default.
Gateway is 192.168.92.1 by default. If your Ethernet LAN does not have a
gateway, set this value to 0.0.0.0.
DNS #1 is the IP address of the chosen Domain Name Server (if one is
desired at all). It is 0.0.0.0 by default.
DNS #2 is 0.0.0.0 by default.
Nodelist Timeout is 1by default, but can be set from 1–100000.
FIFO Depth is 5by default, but can be set from 1–10.
TCP Port is 5001 by default.
UDP Port is 5001 by default.
EDITING IN FIELDS REQUIRING ENTERED VALUES: The default cursor position is
in the Function field. Use the Tab key to advance from field to field. Within each field,
use the cursor arrow keys to position the cursor and the backspace key to erase
characters to the left of the cursor.
CTRL-V toggles the editing mode between the default OVERTYPE:OFF (characters are
inserted as you type) and OVERTYPE:ON (characters are replaced as you type).
EXPLANATION OF EACH FIELD
For the NETWORK configuration at the top of the screen, first set the Function to either
SERVER (if Ethernet clients are to access your ARCNET) or to PROXY (if you plan to
set up an Ethernet backbone between nodes in separate ARCNET LANs).
The Boot Protocol is the next item to be configured. If the IP address is to be set via
Dynamic Host Configuration Protocol, the DHCP option should be selected. When
DHCP is in effect, the following 5 fields are ignored:IP Addr, Netmask, Gateway*,
DNS #1 and DNS #2. If a fixed IP address is to be used, then NONE should be
selected and the five fields listed in the previous sentence should be changed to values
that are appropriate for your Ethernet network.
* NOTE: If AI-SRVR units connect to the network through routers, this is the address of
the router through which access is gained to the rest of the network or to the Internet.
Next, the BRIDGE fields should be configured.
The Node ID can be any value from 1through 255 so long as the designated value is
unique within the ARCNET network to which it belongs.
Speed can be set to 156kbs, 312kbs, 625kbs, 1.25Mbs, 2.5Mbs, 7.5Mbs or 10Mbs.
The 7.5Mbs option is not recommended, but it is provided if a special need exists.
* NOTE: The TB5 and CXB transceivers only support 2.5 Mbps. The 485X transceiver
only supports 1.25 Mbps, 2.5 Mbps and 5 Mbps.

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By default, the Ext Timeout (extended timeout) value of the AI-SRVR is set to STD (no
extended timeout). If the physical size of the network is so great that extended timeouts
are required, then the Ext Timeout value can be increased to 16X,8X or 4X. However,
care must be exercised that all nodes within the ARCNET network are set to the same
extended timeout value — or the network will suffer disruptions.
The COM20022 ARCNET controller within the AI-SRVR is capable of programmable
reconfiguration timeout values. The Recon Timeout setting controls this parameter
which is measured in node counts of 255 (STD), 64, 32 and 16 — allowing operation
with shorter timeouts when the number of nodes permits it. However, care must be
exercised in two respects:If 16Nodes is selected, the network must include a device
whose node ID is 255. And all nodes within the ARCNET network must operate at the
same reconfiguration timeout value — or the network will suffer disruptions.
If you want the AI-SRVR to receive only those ARCNET packets destined for its unique
node ID, set Receive All to OFF. Otherwise, set it to ON.
A provision is included for purging the mailbox of an Ethernet client that has ceased to
communicate with the AI-SRVR. The Nodelist Timeout value determines the wait for a
client connection to "time out" and have all of its mailbox data purged. Each count in
this field corresponds to a time value of 0.1 second. The value is 1by default, but can
be as high as 100000 which equals 10000 seconds (almost 2 hours and 47 minutes).
The number of messages that can be stored in each node's mailbox is limited by the
size of the onboard memory. Each mailbox constitutes a FIFO (first-in-first-out) type of
register. Thus, when a mailbox message limit is exceeded, the first message that was
stored in that mailbox will be lost to make room for the latest message. By default, the
message limit of each mailbox (FIFO Depth)is 5, but this parameter can be set to as
low as 1or as high as 10. The user can manage memory usage by lowering this value
to accommodate many mailboxes or raising it if only a few mailboxes are used.
The TCP Port number and the UDP Port number are each 5001 by default. Each of
these can be set to a value in the range of 1025–65535. However, the only reason to
change either of these values would be if they were in conflict with another application.
Therefore, in almost all situations, these values should be left unchanged
You can exit the configuration screen using any of three CTRL-K codes. (These require
pressing CTRL and K simultaneously, releasing, then pressing the final key):
CTRL-K, Q allows you to exit without saving any changes made to the configuration.
NOTE: Upon re-displaying the configuration screen, changes you have made will still
appear on screen (and give the illusion of having been saved) as long as the equipment
is not restarted — but these field values have not been stored to EEPROM.
CTRL-K, S allows you to exit and save your changes to EEPROM. However, your
changes will not take effect until the AI-SRVR is restarted.
CTRL-K, R saves your changes to EEPROM and restarts the unit so changes will take
effect once reboot completes (some 15 seconds on new units, 50 seconds on older ones).
NOTE: Mailbox content is held in RAM and lost during a restart or loss of power. Only
the configuration settings are stored in EEPROM and are immune to power disruption.

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4.3 AI-PROXY Function
The AI-SRVR offers a function called “AI-PROXY”. This function allows an ARCNET
node in one LAN to communicate with an ARCNET node in another LAN through an
Ethernet backbone link that can be either wired or wireless. A communication path
between two ARCNET networks requires two AI-SRVR units, each serving in one
ARCNET LAN as a proxy for a remote node in the other LAN.
Each AI-SRVR-1 can act as proxy for only one node as shown in Figure 8. In the LAN
on the left, the AI-SRVR-1 will be present as Node ID 2. On the right, the AI-SRVR-1
will represent a Node ID value of 1.
Figure 8 — Each AI-SRVR-1 Can Represent One Node
Each AI-SRVR-8 contains eight ARCNET controllers. Therefore, an AI-SRVR-8 can
represent up to eight nodes as shown in Figure 9. The LAN on the left has sixteen
nodes including nodes 9–16 contained (by proxy) within the AI-SRVR-8. The LAN on
the right also has sixteen nodes — eight individual pieces of equipment and nodes 1–8
represented by the AI-SRVR-8. Multiple AI-SRVR-8 devices can be used when more
than eight ARCNET nodes in an ARCNET LAN need representation.
Figure 9 — Each AI-SRVR-8 Can Represent Eight Nodes

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The AI-SRVR-1 and the AI-SRVR-8 can be used together — for example, to add a
remote ARCNET node to an eight-node ARCNET system as shown in Figure 10.
Figure 10 — AI-SRVR-1 and AI-SRVR-8 Can Work Together
The AI-PROXY concept requires each local proxy represent a node in the remote
network by assuming the Node ID of the remote device being represented. The local
proxy also has a Connections table for these two parameters of each remote proxy:
•Node ID being represented by the remote proxy
•IP Address of the remote proxy
Thus, each Connections table entry associates the local Source ID with the IP Address
through which it is represented in the remote network.
Because a proxy could communicate with many other proxies (up to 255), its
Connections table could be large. No matter how many proxies are involved, each
local proxy must invariably represent a remote node whose ID is not present in the
local network where the local proxy resides.

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4.3.1 AI-PROXY Statistics Screen (Read Only)
A sample AI-PROXY Statistics screen appears in Figure 11. The 3 upper ETHERNET
fields and the ARCNET RX Packets and TX Packets fields serve the same function as
in the AI-SRVR — as do the R, Sand Ccommands. However, the AI-PROXY screen
differs from the AI-SRVR screen in the following ways:
The PROXY Status field replaces the Server Status field of the AI-SRVR. Whenever
the AI-PROXY software is running, this field will report ONLINE.
The AI-PROXY does not have multiple Ethernet clients to maintain — so there is no
Clients field in Figure 11.
The Node ID List field will list up to 8 node IDs being represented by AI-PROXY units.
The AI-PROXY will maintain a list of remote proxies with which it communicates and
this list will appear in the Connections panel (blank by default). Each line in this panel
will report the remote proxy’s node ID and IP address (obtained via a self-discovery
process using broadcast messages). If this list exceeds the size of the panel, scrolling
can be accomplished by the action of two new commands: Nscrolls down to the next
entry (line) in the list and Bscrolls back up.
Pressing the Qkey, will terminate the AI-PROXY program. This option is not available
when the user is connected to the AI-PROXY via the COM2 port because this port only
allows program monitoring — it does not allow configuration or program control.
Figure 11 — AI-PROXY Statistics Screen (Read Only)

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4.3.2 AI-PROXY Configuration
The AI-PROXY configuration screen differs from that of the AI-SRVR in that five fields
have been deleted and two fields added. The default screen is that of Figure 12. The
fields present in the AI-SRVR screen but missing from the AI-PROXY screen are:
Node ID (instead, the AI-PROXY uses the Node ID List field)
Receive All (promiscuous mode is not used in the AI-PROXY)
Nodelist Timeout (Ethernet clients are not used with AI-PROXY)
FIFO Depth (mailboxes are not used with AI-PROXY)
UDP Port (UDP protocol is not used with AI-PROXY)
The two new fields are described below:
Remote Proxy IPs — This field lists only the IP addresses (in the dotted-quad format)
of AI-PROXY units that are separated by a router. Since a router blocks broadcast
messages, such units cannot self-discover their IP addresses as is normally done within
a common subnet. This field can accept up to 256 lines including comment lines that
must begin with the pound symbol (#) and have no more than sixteen characters.
Node ID List — This field is used to enter the decimal value of each node ID being
represented by this proxy device. After each value is typed in, press the ‘Enter’ key. If
the proxy device is an AI-SRVR-8, up to eight values can be entered. When more than
three values are entered, this field will scroll to accommodate another value. You can
scroll this field with the up and down arrow keys.
Figure 12 — AI-PROXY Default Configuration Screen

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EXAMPLE: Figure 13 shows how (using sample values) the fields of an AI-SRVR-8/CXB
might be configured in AI-PROXY mode. Only those field that have had their default
values changed are discussed:
Boot Protocol has been set to DHCP.
IP Addr DHCP server has assigned 10.0.0.49 to this proxy unit.
Gateway has been set to 10.0.0.1.
DNS #1 has been set to 159.245.99.5.
Remote Proxy IP’s has two entries for proxy units outside the local subnet.
Node ID List has three values visible (of a list potentially as great as eight)
of the node IDs being represented by this AI-SRVR-8/CXB.
Figure 13 — Example AI-PROXY Configuration Screen