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Communication parameters
Baud Rate Disclaimer
5 - Ethernet communication interface (ports ETH1 and ETH2)
Introduction
Description of terminal box
Type of cable required
Maximum distance
between devices
13 | © 2022 ABB | - 1SDH002203A1002
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.
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.
E-kit is provided with two network interfaces which function like switches.
ETH1/ETH2:
192.168.0.10
The connector for Ethernet communication is the RJ45 type. Pin allocation is given in the next table:
Interface
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.
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.
255.255.255.0
Pins
Signal
1
TxD+
2
TxD-
3
RxD+
4
NU
5
NU
6
RxD-
7
NU
8
NU
Shield
Shielded cable
0.0.0.0
Description
Data Transmitted +
Data Transmitted -
Data Received +
Not used
Not used
Data Received -
Not used
Not used
Ground signal
Ethernet communication interface (ports ETH1 and ETH2)
ABB | E-kit
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