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Web Thermometer

Is there a facility for assigning the IP address via the serial interface without a PC?

If you have a handheld PC (e.g. a palm), you have the facility of assigning the IP address via the integral serial interface of the handheld PC. Suitable terminal programs for handheld PCs can be found

 

In DHCP environments, how are Web Thermometers prevented from being given spurious IP addresses?

In order to prevent this problem, the Web Thermometer operates using the DHCP-compatible BOOTP protocol. Unlike DHCP, the BOOTP protocol is based on the permanent reservation of certain IP

 

Why can’t I assign an IP address through the serial port?

  1. Regardless of the serial transmission parameters set for normal operation, the Web Thermometer expects for entering the "x" characters (=ASCII 120) on boot-up always the transmission format 9600 baud, 8 data bits, no parity.
 

Why can’t I assign an IP address using a static entry in the ARP cache?

  • This method can only be used if the Web Thermometer does not already have a different IP address. (See also How can a Web Thermometer having an unknown IP address be assigned a new one?).
 

How can a Web Thermometer having an unknown IP address be assigned a new one?

The simplest and invariably effective method is to assign a new IP address via the serial port with the aid of a terminal program. This method overwrites the existing setting

 

How does the Web Thermometer obtain the valid subnet mask and gateway address?

In order to be able to communicate beyond the local network, in addition to the IP address, the Web Thermometer also requires the subnet mask and gateway address applicable for

 
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