RS-232 NULL Modem Wiring
The following table and diagram shows how to create a null modem cable/adapter for RS-232 connections.
IMPORTANT
:
A null modem cable is required if you are connecting your SB72EX to a single computer.
A standard serial cable will not
work!
Network IP Address Configuration
If you are part of an existing network, are not using DHCP, stop reading now, and go get a Static IP
Address and Network Mask address from your network administrator. If you follow the advice in this
paragraph on an existing network without an assigned Static IP Address, your Network Administrator will
hunt you down....
IP Addresses are used to route packets from place to place on an Intranet/Internet. If you are
not
part of an
established network, and your Ethernet segment is isolated, you can choose just about any IP Address you
desire. The "powers that be" have actually set aside some addresses for isolated networks. They are
documented in RFC1918. The reserved ranges are:
Class A:
10.0.0.0 to 10.255.255.255
Class B:
172.16.0.0 to 172.31.255.255
Class C:
192.168.0.0 to 192.168.255.255
If you are doing development on an isolated network, you can use the following addresses:
Set your host computer's Network Adapter Card IP Address to 10.1.1.10
•
•
•
Note:
Only change the Network Adapter Card; do
not
change your Dial-Up Adapter settings.
Set the Static IP Address of your SB72EX to 10.1.1.11
Set the Network Mask address for both your host computer network and your SB72EX to
255.255.255.0
Web Browsers and Proxy Servers
If you are working on a corporate LAN that uses a proxy server for Internet web browsing, you will need to
exclude the IP Address of your SB72EX in your web browser’s proxy server settings/preferences.
Otherwise, an attempt to connect to a web page on the LAN will fail because the proxy server will attempt
to route the request outside the LAN. For most web browsers, this can be accomplished in the advanced
settings for the proxy server configuration. Set the Network Mask for your host computer’s network
adapter and your SB72EX to 255.255.255.0.
SB72EX User's Manual, 350030-001
Page 16
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