1.1 Introduction

This manual describes the MbDrv driver for data exchange between the REX Control System and various devices supporting the Modbus protocol [1]. The driver supports both the RTU version for the RS-232 or RS-485 serial lines and the TCP/IP version.

The driver supports both Master and Slave modes. Thus in fact the MbDrv driver contains 4 drivers – serial line Master, serial line Slave, TCP/IP Master and TCP/IP Slave. All versions have much in common and must be installed all at once.