Intelligent Technologies Modbus to QCPort Adapter Manual
January 2006
MN05002002E (C)
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Page 15
Ethernet Addressing
The Modbus Adapter supports addressing using a Static IP address and also using
BOOTP (default).
The following registers are used to setup and configure the TCP address.
Table 10 TCP/IP Configuration
Description Modbus
Register
Size
(Reg)
Usage Read/
Write
MAC ID
7527
3
48 bit Hardware address
R
IP address
7530
2
The current active IP address
HH.HL.LH.LL
Word 7530 - HH HL
Word 7531 - LH LL
R/W
IP address mode
7532
1
0 – 192.168.10.1
1 – Static IP
2 – BootP (default)
3 – Save (saves the BootP address
as static and sets mode to static IP)
R/W
Subnet Mask
7533
2
The current active subnet mask
HH.HL.LH.LL
Word 7533 - HH HL
Word 7534 - LH LL
R/W
Default Gateway
7535
2
The currently set default Gateway
HH.HL.LH.LL
Word 7535 - HH HL
Word 7536 - LH LL
R/W
Allowed Sockets
7537
1
# of Modbus socket connections
allowed
R/W
Modbus TCP Slave
Address
7538
1
The MBAP header unit ID which this
Modbus Adapter will respond to
(default 1)
R/W
It is suggested that a BootP service is used to set the original IP address within the
Adapter. Once the IP is chosen set Register 7532 to 3 and the IP address will be saved
as the static address and will use that address at every power up. Register 7532 will be
set to 1 automatically after the IP address is saved to nonvolatile memory.
If a BootP service is to be used to set the IP address at every power up, it is not
necessary to change the setting for register 7532.