VP-1405A Advanced Power
Chapter 6 - Protocol and Communication
V-PM1000 Series, Veesta Power Module Product Series
48V Power Supply & Charger Instructions & User's Manual
Page 31 of 46
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Chapter 6 -
Protocol and Communication
6.1
PLC Modbus® Compatible
The Modbus® communications protocol allows information and data
to be efficiently transferred between the VP-1405A and Modicon
programmable logic controller (PLC) or other third party Modbus®
compatible monitoring and control system. The VP-1405A also can
establish a monitoring system simply to adopt an IPC-based
centralized master running software.
6.2
Comprehensive System Integration
The VP-1405A provides the Modbus® compatible as a standard
feature for comprehensive system integration. The PLC compatible
RS485 Modbus® communication protocol allows information and
data to be transferred efficiently between the VP-1405A and PLC,
existing RTU Power SCADA system, DCS system, IPC running
software.
6.3
Transmission Mode
The mode of transmission is the structure of the individual units of
information within a message, and the numbering system used to
transmit the data. The mode is defined in the following which is
compatible with Modbus® protocol - RTU Mode.
Table 6-1: VP-1405A Modbus conventions table
Item
Convention
Coding System
8-bits binary
Start bits
1 (default), 2
Data bits
8
Parity
No parity (default), Odd, Even
Stop bit
1 (default), 2
Error Checking
CRC (Cyclical Redundancy Check)
Start of Frame
silence on line for time ≥ 4 characters
