EKI-1221/1222/1224 User Manual 2
1.1 Overview
Advantech’s EKI-1200 series of Modbus Data Gateways are a robust, feature-rich,
and cost effective way to integrate of Ethernet and Serial Modbus devices. The EKI-
1221/1222/1224 provides one, two or four serial ports, two switched Ethernet ports, a
wide range of power inputs, and a compact slim design, making them an ideal
solution for connecting multiple Modbus/RTU and Modbus/ASCII serial devices to
Modbus TCP (Ethernet).
Originally developed for PLCs in industrial automation and manufacturing control
applications, Modbus is one of the most popular open standard protocols in use
today. The communication mode can be Modbus RTU/ASCII (Serial) or Modbus TCP
(Ethernet). Many industrial devices use Modbus as their communication standard.
However, the Ethernet-based Modbus protocol is different from the original serial-
based protocols that a Modbus Data Gateway is needed to be a bridge for
integration.
The two Ethernet ports allow the EKI-1221/1222/1224 to establish two separated
Ethernet connections to two Ethernet domains or two Ethernet switches in the same
domain. Through a dual Ethernet connection, the EKI-1221/1222/1224 greatly
improves the device connectivity reliability, increase system stability, and simplify the
redundant configuration.
The Modbus/RTU and Modbus/ASCII protocols define how a “master” device polls
one or more “slave” devices and write real-time data over RS-232, RS-422, or RS-
485 serial data communication. The EKI-1221/1222/1224 provides a feature that can
allow users to select master or slave operation for each serial port. EKI-1221/1222/
1224 not only allows Ethernet master can control serial slaves, but it can also allow
serial masters to control Ethernet slaves. Further more, the EKI-1221/1222/1224 can
allow both Ethernet and serial slaves to be controlled by both Ethernet and serial
masters.
The EKI-1221/1222/1224 provides various operation modes: RTU Master, RTU
Slave, ASCII Master, and ASCII Slave.
1.2 Features
Provides dual 10/100 Mbps auto-sensing Ethernet ports
Compact design without any hardware configuration
Integration of Modbus TCP and Modbus RTU/ASCII networks
Supports baud rate up to 921.6 Kbps
Support up to 16 connections and 32 requests simultaneously
Supports 31 slaves per serial port
Provides easy to use configuration utility
Software selectable RS-232/422/485 communication
Auto searching slave ID over configuration utility
Surge protection for RS-422/485 line and power input
Mounts on DIN-rail, wall, or panel
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