Proroute
GEM
2M
4G
Router
GEM-2M series User Manual
126
3.2.7.3 Modbus
Modbus is one of the most popular automation protocols in the world, supporting
traditional RS-232/422/485 devices and recently developed Ethernet devices. Many
industrial devices, such as PLCs, DCSs, HMIs, instruments, and meters, use Modbus
as the communication standard. It is used to establish master-slave/client-server
communication between intelligent devices.
However, the Ethernet-based Modbus protocol is so different from the original
serial-based protocols. In order to integrate Modbus networks, the GEM-2M series,
including a serial ports that support RS-232 and RS-485 communication interface,
can automatically and intelligently translate between Modbus TCP (Ethernet) and
Modbus ASCII/RTU (serial) protocols, allowing Ethernet-based PLCs to control
instruments over RS-485 without additional programming or effort.
• Integration of Modbus TCP and Modbus RTU/ASCII networks
• Software-selectable RS-232/485 communication.
• High speed serial interface supporting 460.8 Kbps
NOTE: All devices that are connected to a single serial port must use the same
protocol (i.e., either Modbus RTU or Modbus ASCII).
