Introduction; Protocols; Modbus; Dnp3 - HindlePower AT10.1 Series Operating Instructions Manual

INTRODUCTION / PROTOCOLS

1 Introduction

The AT Series Communications Module option allows users to remotely monitor and control
an AT Series Battery Charger over a serial connection. With this option, users may perform
remotely everything that is accessible at the charger's front panel display.
The AT Communications option supports DNP3 Level 2 and Modbus protocols over RS-232,
RS-485, and Ethernet (when Ethernet option is ordered). Configuration is performed by DIP
switches and a setup program for additional parameters. The communications board supports
baud rates of 9600 bps and 19200 bps. For more information see the Frequently Asked
Questions in Appendix A on Page 34.

2 Protocols

2.1 Modbus

The communications option can be setup to communicate on standard Modbus networks
using either of two (2) transmission modes: ASCII (American Standard Code for Information
Interchange) or RTU (Remote Terminal Unit). The advantage of ASCII allows less strict
serial timing requirements without causing communication errors. The advantage of RTU
allows more data to be transmitted than ASCII mode for higher throughput.
Modbus ASCII mode supports the following serial settings:
• No parity, 7 data bits, 2 stop bits
• Even parity, 7 data bits, 1 stop bit
• Odd parity, 7 data bits, 1 stop bit
Modbus RTU mode supports the following serial settings:
• No parity, 8 data bits, 1 stop bit
• No parity, 8 data bits, 2 stop bits
• Even parity, 8 data bits, 1 stop bit
• Odd parity, 8 data bits, 1 stop bit
Refer to the Modbus Section 8 on page 30 for information on its implementation.

2.2 DNP3

The communications option supports DNP3 Level 2. This implementation of DNP3 meets
Level 2 conformance and supports change events with unsolicited messaging.
The DNP3 Level 2 protocol supports the following serial settings:
• No parity, 8 data bits, 1 stop bit
• No parity, 8 data bits, 2 stop bits
• Even parity, 8 data bits, 1 stop bit
• Odd parity, 8 data bits, 1 stop bit
Refer to the DNP V3.00 Section 7 on page 19 for information on its implementation.
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