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Measurement Specialties Inc. NetScanner System (9016, 9021, & 9022) User’s Manual

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9016 and 1 for 9021/9022) and yyy.zzz is derived from the module serial number. A similar

method is used to calculate each module’s Ethernet hardware address shown on the module tag.

Note that each of these fields (separated by a period, ‘.’) is a decimal representation of a byte

value. This means that each field may have a maximum value of 255. For 9016 modules with

serial less than 255, this default IP address will be 200.200.0.zzz where zzz is the serial number

(i.e., 9016 serial number 212 is IP 200.200.200.212) . For 9016 modules with serial numbers

greater than 255, the default IP of 200.200.y.zzz is calculated as follows:

y is the integer result of dividing the module serial number by 256.

zzz is the remainder of dividing the serial number by 256 (serial number modulus 256).

These calculations may be verified by checking that y * 256 + zzz equals the original module

serial number. Once a module has powered-up and has assigned itself a default IP address it is

capable of communications.

An alternate method for assigning an IP address to an Ethernet module is referred to as a

Dynamic IP assignment. This method allows a module to have its IP address dynamically

assigned at power-up by an application running on a node of the TCP/IP or UDP/IP network.

When configured for Dynamic IP address assignment protocols, the reset module will broadcast

its Ethernet hardware (MAC) address on the network in a Dynamic IP request packet. This

broadcast packet identifies the module by its hardware address and requests that a dynamic IP

server application return to it an IP address for use. Once this broadcast message is received, the

dynamic server application will then return an IP address to the module in a dynamic IP reply

packet. Most dynamic IP server applications determine this IP address from a user maintained

file that lists Ethernet hardware addresses with their desired IP address. If modules are added to

the network or module IP addresses are to be changed, the user can simply edit this configuration

file. This capability is common on most UNIX based machines and is also available (although

less common) in some TCP/IP packages available for PC platforms.

Support of the Dynamic IP server protocol is not currently included in the Windows

95/98 or

Windows

NT operating systems. In order to allow users of PC platforms to make use of the

Dynamic IP capabilities of the 9016, 9021, and 9022, a simple Windows

95/98/NT application

is capable of acting as a Dynamic IP server. This application is referred to as BOOTP Lite since

it actually makes use of the BOOTP protocol that closely resembles the Dynamic IP request.

Like traditional dynamic IP servers, this application allows the user to configure a file that

contains Ethernet hardware addresses and the corresponding IP address to assign to those

devices. This application is free of charge and capable of running as a background program on

Windows

95/98/2000 and NT machines. It may be downloaded from the MEAS website,

www.meas-spec.com.

NOTE: After closing the TCP/IP connection to the module, the host must wait 10

seconds before re-connecting.

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Pressure Systems 9022 Manuel d'utilisateur Page 24

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