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Introduction

02/13 Modbus® RTU Serial Communications User Manual 1

1. Introduction

1.1 Modbus RTU Implementation

This implementation is designed to provide a popular data exchange format connecting these instruments

to both Honeywell and foreign master devices. The Modbus RTU allows the instrument to be a citizen on a

data link shared with other devices that subscribe to the Modbus RTU RS-485 specification.

These instruments DO NOT emulate any MODICON type device. The Modbus RTU specification is

respected in the physical and data link layers. The message structure of the Modbus RTU function codes is

employed and standard IEEE 32-bit floating point and integer formats are used. Data register mapping is

unique to these instruments. The definition in Table 2-1 is the register mapping for many Honeywell

instruments and the corresponding parameter value within those instruments.

1.2 Modbus RTU Configuration Interface

This user manual does not include the configuration interfaces for the instruments supporting the Modbus

RTU Protocol. The following table describes the references to the specific instrument’s communication

and configuration user manuals.

Table 1-1 Communication and Configuration User Manuals

Instrument Model User Manual Part Number

RSX, VPR, VRX, UDC5300 51-52-25-68

Minitrend V5, Multitrend Plus

43-TV-25-08 Communications Manual

eZtrend V5 43-TV-25-08 Communications Manual V5 (Modbus TCP/IP only)

QX and SX (X Series) 43-TV-25-30

DR4300 51-52-25-71

DR4500 51-52-25-69

UDC2300 51-52-25-75

UDC3300 51-52-25-70

51-52-25-38 UDC3000A Modbus 485 RTU Communications Manual

DPR100 US1I-6149 DPR100C-DPR100D Communication Option Manual

DPR180/DPR250 EN1I-6189 DPR180/DPR250 Communication Option Manual

10260S/11280S/

SA201/SA2002

51-52-25-103 Modbus Configuration Interface for Herculine Actuators

UDC2500 51-52-25-127

UDC2500 Limit Controller 51-52-25-118

UDC3200 51-52-25-119

UDC3500 51-52-25-120

1 2 3 4 5 6 7 8 9 10 11 12 ... 75 76

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Siemens NAN 67 Series Manual de usuario Pagina 7