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4.3 CIU 262 Cellular Modbus
The table below provides an overview of the specifications for
Grundfos CIU 262. For further details, refer to the specific
sections of this functional profile.
4.4 CIU 502 Modbus TCP
The table below provides an overview of the specifications for
Grundfos CIU 502 for Modbus TCP. For further details, refer to
the specific sections of this functional profile.
Modbus cellular specifications
Description
Comments
Data protocol
Modbus RTU/Modbus TCP
Call-up connection uses RTU.
Data connection uses TCP.
Slave address
Factory 231 (0xE7)
Can be changed via Modbus register 00003,
SoftwareDefinedModbusAddress.
Cellular-connection visual diagnostics
LED1
See section
.
Maximum Modbus telegram size
260 bytes
Total Modbus TCP/IP application data unit. See fig.
.
Modbus TCP specifications
Description
Comments
Application layer
DHCP, HTTP, Ping, FTP, SMTP, SNTP,
Modbus TCP
Rotary switch in position 1.
Transport layer
TCP
Internet layer
Internet protocol V4 (IPv4)
Link layer
ARP, media access control (ethernet)
Ethernet cable
Screened or twisted-pair cables, CAT5,
CAT5e or CAT6
Supports Auto-MDIX
Maximum cable length
100 m
Transmission speed
10 Mbits/s, 100 Mbits/s (auto-detected)
Industrial ethernet protocols
PROFINET IO, Modbus TCP
Selected with rotary switch, section
