ICP DAS USA SG-785 Manual de usuario

SG-785 Hardware User Guide

Ver. 1.0

Last Modified 10/26/2009

Introduction

The SG-785 is an optional module that is used to improve the communication

of RS-485 network. It provides switch selectable pull-high and pull-low

resistors on RS-485 network. It also has 15-step switch selectable termination

resistor such that the user can select a proper termination resistor to be

connected to the RS-485 network easily.

Specifications

General

Interface RS-485

Pull-high/pull-low Resistance

1k Ω

Termination Resistance 15 steps, 65 ~ 560 Ω

LED Display 1 red LED as power indicator

1 green LED as termination indicator

Power

Input Range 10 ~ 30 V

Power Consumption 0.5W, 24 V

Environment

Operating Temperature -25 °C ~ +75 °C

Storage Temperature -40 °C ~ +80 °C

Humidity 5 ~ 95 % RH, non-condensing

SG-785 Pin Assignment

LED Display

PWR Power LED, Red

TR Termination Resistor LED, Green

Switches

TR Termination Resistor Setting

SW Termination Resistance and Pull-high/Pull-low Setting

Terminal Block

(Y)DATA+, (G)DATA-

RS-485 Data Line

(R)+Vs, (B)GND Power Line

F. G. Frame Ground

SG-785 Switch Setting

RS-485 Termination Resistance Setting

SW1 SW2 SW3 SW4 Termination Resistance (ohm)

ON ON ON ON 65

ON ON ON OFF 74

ON ON OFF ON 76

ON OFF ON ON 81

ON OFF OFF ON 99

ON OFF ON OFF 96

ON ON OFF OFF 88

ON OFF OFF OFF 120

OFF ON ON ON 144

OFF ON ON OFF 193

OFF ON OFF ON 207

OFF ON OFF OFF 330

OFF OFF ON ON 256

OFF OFF ON OFF 470

OFF OFF OFF ON 560

RS-485 pull-high and pull-low setting

SW5

SW6

RS-485 Data Line Status

OFF OFF No pull-high/pull-low to RS-485 data line

ON OFF Add a pull high resistor to DATA+ line

OFF ON Add a pull low resistor to DATA- line

ON ON Add a pull high resistor to DATA+ line and add a pull

low resistor to DATA- line

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