Bacharach MGS 400 User Manual

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Bacharach MGS 400 User Manual Manual pdf 32 page image

1100-2294 Rev 1 31Baud RateSets instrument baud rate for connection to RS-485 Modbus interface. (Default: 9600 baud) Toset baud rate: Configure Tab  Modbus  Baud Rate, select 9600/19200, select OK to confirmStop BitsSets instrument stop bits for connection to RS-485 Modbus interface. (Default: 1 stop bits) Toset number of stop bits: Configure Tab  Modbus  Stop Bits, select 1 or 2, select OK to confirmParitySets instrument parity for connection to RS-485 Modbus interface. (Default: None) To set parity: Configure Tab  Modbus  Parity, select None/Odd/Even, select OK to confirmIMPORTANT: Stop bits must be set to 1 where parity is odd or even.Enable 120Ω TerminationFor optimal communication reliability, in RS-485 Modbus networks the last instrument physicallyconnected to the RS-485 bus must include a 120Ω termination resistor. This is to reduce thepotential for electrical signal reflection on long buses due to impedance mismatches.Typically, this requires a physical resistor with the same characteristic impedance of the buscable to be installed on the bus.MGS-400 instruments include this termination resistor on all instruments and allow thistermination to be enabled via this configuration setting without the need for an external physicalresistors. To enable this termination resistor: Configure Tab  Modbus  Enable 120Ω Termination, select enable/disable, select OKto confirmIMPORTANT: Termination resistor should only be enabled on last instrumentphysically connected to RS-485 bus. An external resistor should not beconnected where this is enabled on the instrument.4.2.3.7 Output ConfigurationAnalog Output RangeSets instrument analog output range. Available ranges: 1-5V (Default), 0-5V, 0-10V, 2-10V, 4-20mA. To set range: Configure Tab  Outputs  Analog Output Range, select desired range, select OK toconfirm