B&K 2250 Light Uživatelský manuál stáhnout pdf (Strana 94)

Hand-held Analyzer Types 2250 and 2270 – User Manual

For hardware version 4, modems with an RS–232 serial interface can be connected using a

USB to serial converter inserted in the USB Type A socket of the analyzer. The following USB

to serial converters have been tested:

• USB to RS–232 Converter UL-0250 (See “Ordering Information” on page 216.)

• ES-U-1001-R10, ES-U-1001-B10 and ES-U-1001-A from EasySync

(www.easysync-ltd.com)

• USB to RS232 Standard, USB to RS232 Professional and USB to RS232 Mini STD from

U.S. Converters (www.usconverters.com)

For hardware versions 1 – 3, use a compact flash-to-serial converter inserted in the compact

flash slot of the analyzer. Serial I/O CF Card – Ruggedized from Socket (www.socket-

mobile.com) has been tested.

Compact Flash Modems (for Hardware Versions 1 – 3)

Compact GPRS from Pretec (www.pretec.com) has been tested.

Compact flash modems can be inserted directly in the compact flash socket of the analyzer.

8.2.3 DynDNS

If the analyzer is connected to the Internet through a GPRS/EDGE/HSPA modem or a local

network with access to the Internet through a DSL modem/router and you want to connect to

the analyzer from a place outside the local network, then you need to know:

• Global IP address of the analyzer, or

• Global IP address of the DSL modem/router (and ensure that correct port forwarding in

has been set the router – details in the online help for BZ-5503)

In some cases, the global IP address is static and will never change, so you connect to the

analyzer using BZ-5503 or an Internet browser using this IP address.

Normally when you browse to addresses using an Internet browser you do not use the IP

address itself, but a hostname for it (for example, you would use the hostname

www.google.com instead of ‘74.125.77.99’). This requires a DNS (Domain Name System)

provider, which is a kind of Internet phone book that translates hostnames to IP addresses

for you.

However, for a GPRS/EDGE/HSPA or even a DSL router, often the global IP address is

renewed at each new connection or at certain time intervals (for example, every two weeks). In

this case you will have to change the IP address in BZ-5503 or the Internet browser

accordingly. To avoid this, a service like DDNS (Dynamic Domain Name System) can be used.

DDNS is a network service that provides the capability for a modem/router/computer system to

notify a domain name system provider to change, in real time (ad-hoc), the active DNS config-

uration of its configured hostnames and IP addresses. This will ensure that the hostname you

use will always be updated to reflect the correct IP address.

The analyzer supports DDNS provided by the worldwide DDNS service provider

‘DynDNS.com’.

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B&K 2250 Light Uživatelský manuál Strana 94