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
