Emerson OpenComms-485 Manual de usuario descargar pdf (Pagina 5)

Modbus Communications

1.0 MODBUS COMMUNICATIONS

1.1 Connectivity to Liebert IntelliSlot 485 Using Modbus

This publication describes using the Modbus communications protocol with the Liebert IntelliSlot

485 interface card, as well as with the Liebert OpenComms

™

485 Card and Liebert OpenComms

NIC485 Card. It includes information on using Modbus to pass information to and from the Liebert

IntelliSlot 485 card via Modbus. It also offers information about supported types, frame format,

function code support and similar subjects.

1.2 Compatibility with Liebert Equipment

Table 1 shows the type of Liebert IntelliSlot 485 card required for selected Liebert products.

Table 1 Liebert Equipment and Compatible Liebert IntelliSlot 485 Cards

Product Supported Card

Liebert Nfinity Liebert IntelliSlot 485 Card

Liebert NX Liebert IntelliSlot 485 Card

Liebert PowerSure Liebert IntelliSlot 485 Card

Liebert GXT2 Liebert IntelliSlot 485 Card

Liebert HiNet Liebert IntelliSlot 485 Card

Liebert IntelliSlot Web/485 Card with Adapter

Liebert Series 600 UPS

Liebert IntelliSlot 485 Card with Adapter

Liebert IntelliSlot Web/485 Card with Adapter

Liebert Series 610 SCC

Liebert IntelliSlot 485 Card with Adapter

Liebert IntelliSlot Web/485 Card with Adapter

Liebert Series 300 UPS

Liebert IntelliSlot 485 Card with Adapter

Liebert DS Liebert IntelliSlot 485 Card

Liebert XDF Liebert IntelliSlot 485 Card

1.3 Implementation Basics

Modbus protocol provides control and data acquisition, through query and response, between master

and slave devices. This protocol comprises the rules for communication, controlling the message

format between devices, how master and slave devices initiate communications, as well as unit

identification, message-handling and error-checking.

The Liebert IntelliSlot 485 card acts as a slave device on a network. This network can be a multidrop

configuration over EIA-485, where multiple slaves reside on a common wire or loop.

1.4 Transmission Format

The Liebert IntelliSlot 485 interface card supports Modbus Remote Terminal Unit (RTU)

transmission modes. See

Table 2 below.

Table 2 Modbus Remote Transmission Unit settings for Liebert IntelliSlot 485 interface card

Physical Port

Transmission

Mode

Baud Rate Data Bits Parity Bits Stop Bits

Start

Bits

EIA-485/422

2 wire

RTU 9600, 19200 or 38400 8 None 1 1

1 2 3 4 5 6 7 8 9 10 ... 51 52

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Emerson OpenComms-485 Manual de usuario Pagina 5

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