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ABB | E-kit
Ethernet communication interface (ports ETH1 and ETH2)
Communication parameters
All of the devices in the same Modbus network must have the same communication parameters. The values
of each parameter are given below:
• data transmission speed, known as baud rate: 9600 bps;
• data bits (number of bits): 8;
• parity bits: Even;
• stop bits: 1;
• address of each slave
E-kit Master will only be able to acquire data when the parameters of all the devices have been set correctly.
Baud Rate Disclaimer
The baud rate of E-kit is: 9600 baud/s.
Sampling time is about 26 seconds using the Modbus RTU protocol and connecting up to 15 devices.
For this reason, it is inadvisable to acquire data at higher frequency.
5 - Ethernet communication interface (ports ETH1 and ETH2)
Introduction
E-kit is provided with two network interfaces which function like switches.
ETH1/ETH2: 192.168.0.10 255.255.255.0 0.0.0.0
Description of terminal box
The connector for Ethernet communication is the RJ45 type. Pin allocation is given in the next table:
Interface Pins Signal Description
1 TxD+ Data Transmitted +
2 TxD- Data Transmitted -
3
RxD+ Data Received +
4 NU Not used
5 NU Not used
6 RxD- Data Received -
7 NU Not used
8 NU Not used
Shield Shielded cable Ground signal
Type of cable required
Use braided twisted pair cables (TP cables) of at least category 3 (IEA / TIA 568-A-5 Cat3) or class C
(according to the European standards) for 10 MBit/s (10Base-T) Ethernet.
Braided twisted pair cables (TP cables) of category 5 (cat5) or class D or higher should be used for 100 Mbit/s
(fast) (100Base-TX) Ethernet.
Maximum distance
between devices
The maximum length of a trunk, i.e. the maximum distance between two network components, is limited to
80 m due to the electrical properties of the cable.
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