ABB COMMANDER 500 - Introduction

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1 INTRODUCTION
This Operating Guide describes the COMMANDER 500 MODBUS serial data communications
option and must be used in conjunction with the standard User Guide (part no. IM/C501 or IM/C505)
supplied with the instrument.
Information.
The MODBUS option provides the following facilities:
• Standard RS422/485 communications.
• MODBUS RTU protocol – for master (host computer) to slave (COMMANDER 500) system.
• Isolation from external connections to the instrument. Dielectric strength 500V d.c. for 1
minute.
• Two-wire or four-wire communication.
• 2400, 9600 or 19200 baud transmission rate.
• Parity-checking – odd, even or none.