22-2 9440300990
Communication DECS-250
Figure 22-1. RS232 Setup
Modbus
®
Communication
BESTCOMSPlus Navigation Path: Settings Explorer, Communications, Modbus Setup
HMI Navigation Path: Not available through HMI.
DECS-250 systems support the RS-485 mode and Modbus TCP (Ethernet) mode at the same time.
DECS-250 Modbus communication registers are listed and defined in the Modbus Communication
chapter of this manual.
Modbus settings for RS-485 and Ethernet are illustrated in Figure 22-2 and consist of RS-485 Unit ID,
RS-485 Response Delay, and Ethernet Unit ID.
Figure 22-2. Modbus Setup
RS-485 Port
BESTCOMSPlus Navigation Path: Settings Explorer, Communications, RS-485 Setup
HMI Navigation Path: Settings, Communications, RS-485 Setup
An RS-485 port uses the Modbus RTU (remote terminal unit) protocol for polled communication with other
networked devices or remote annunciation and control with an IDP-801 Interactive Display Panel. RS-485
port terminals are located on the left side panel and are identified as RS-485 A, B, and C. Terminal A
serves as the send/receive A terminal, terminal B serves as the send/receive B terminal, and terminal C
serves as the signal ground terminal. Figure 22-3 illustrates typical RS-485 connections for multiple
DECS-250 controllers communicating over a Modbus network.
To Next Page
Loading...
