C
C. IP Report Protocol
There are several ways to configure the IP address of the NPort device server. One of them is DHCP Client.
When you set up the device server to use DHCP Client for IP address configuration, it will automatically send a
DHCP request over the network to find the DHCP server. The DHCP server will then send an available IP address
to the NPort with an expiration time. The NPort will use this IP address until the expiration time has been
reached. When the expiration time has been reached, the process will repeat, and NPort will send another
DHCP request to the DHCP server. Therefore, an NPort may end up using more than one IP address while it is
connected to the network.
The NPort has a built-in IP address report function that will send its IP data to a specific IP address and port
number when it is configured with a dynamic IP address. In the web console, the IP report parameters may be
configured under Network Settings. Enter the IP address and the port number of the PC that is to receive this
information, as well as the reporting interval
To interpret the IP address report, the destination PC needs to have NPort Administrator installed with the IP
Address Report function activated. You may also use develop your own application to receive the IP address
report by referring to the IP report protocol described here. An example program is provided on the Moxa
website at www.moxa.com.
IP Address Report Structure
The first 4 bytes of the module’s IP address report are the characters “Moxa”. The rest of the report is
composed of 9 items, with each item preceded by a 2-byte header indicating the item ID and item length.
Header
(Item ID)
Header
(Item Length)
Item
(none) (none) “Moxa” (text string)
1 (varies) server name (text string)
2 2 hardware ID (little endian, see table below)
3 6 MAC address (00-90-E8-01-02-03 would be sent in sequence as 0x00,
0x90, 0xE8, 0x01, 0x02, 0x03)
4 4 serial number (little endian DWORD)
5 4 IP address
6 4 netmask
7 4 default gateway
8 4 firmware version (little endian DWORD, Version 4.3.1would be
0x04030100)
9 4 AP ID (little endian DWORD, see table below)
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