Pneumercator MODBUS RTU RS-485 User Manual

MODBUS RTU Instruction Manual - 2017-11-02.docx Page 1 of 14 November 2, 2017
INSTRUCTION MANUAL
MODBUS RTU INTERFACE CARD
FOR
TMS SERIES AND LC2000 SYSTEMS
This document describes the installation and setup of the MODBUS RTU RS-485 Interface Card,
P/N 900552-x. Also provided are communications protocol and register mapping used to interface from
the TMS/LC2000 console to a host or master computer system supporting MODBUS RTU protocol.
Communications is over a half duplex, single twisted-pair RS-485 cable. Information available from the
TMS/LC2000 includes continuous tank data and tank-related alarms, leak/point level sensor statuses
and contact closure input statuses. The MODBUS Communications Card includes dipswitches for slave
address and baud rate selection, and provides LED indicators for transmit and receive activity. See
Section 3.0 Product Specifications for details.
DWG NO. 20198 REV. N/C

Pneumercator MODBUS RTU RS-485 Specifications

General

Brand	Pneumercator
Model	MODBUS RTU RS-485
Category	Computer Hardware
Language	English

Summary

Installation and Setup

Dip Switch Settings

Details the configuration of dip switches for setting slave address and baud rate.

Installation of MODBUS Card

Provides diagrams and instructions for installing the MODBUS card into different TMS/LC2000 models.

Terminal Connections

Describes the plug-in terminal block for RS-485 Modbus connections and multi-drop wiring.

LED Indicators

Describes the visual indication of Modbus activity provided by SLAVE RECEIVE (RX) and SLAVE TRANSMIT (TX) LEDs.

MODBUS Function Format

TMS/LC2000 Data Register Map

MODBUS Status Register Detail

Details the LSB and 2SB of the MODBUS Status Register (MSR) for communications and data acquisition status.

Tank Data Register Detail

Explains the register addresses and data formats for Tank Data Registers, with a note for LC2000.

Tank Status Register Detail

Provides details on the Tank Status Register based on different TMS firmware versions.

Table #1: Status Details

Details the status bits for Wired and Wireless Systems, including Ullage Mode.

Table #2: Status Details

Details the status bits for Wired and Wireless Systems, including Six-Product Setpoint Firmware.

Sensor Data Register - Status Detail

Explains the status bits for sensors, including Normal, Alarm, Fault, and Active states.

Contact Closure Data Register - Status Detail

Details the status bits for Contact Closure registers, covering Not Active, Relay Control, Gate Control, and Alarm states.

Product Specifications