Moxa Technologies A60, A51 manual Multidrop

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Chapter 3

Operation

 

 

3.2 Multidrop

Multidrop configuration means that more than two devices (Max. 10 for RS-422; Max. 32 for RS-485) can be linked all together to communicate one another through many A50 (or A51) devices. In this configuration, one of the A50 (or A51) will be connected to a master device and the rest of A50 (or A51) devices will be connected to any other slave devices.

4-wire Full Duplex

Master DTE/

DCE

A50/A51

TA RS-232 RS-485 TB RB RA GND

A50/A51

RA

RB RS-485 RS-232

TB

TA

GND

A50/A51

RA

RB RS-485 RS-232

TB

TA

GND

Slave DTE/

DCE

Slave

DTE/

DCE

14

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Contents A50/A51/A60 A50/A51 A60 Copyright Notice Moxa Internet Services Table of Contents Part II A60 RS-232 Surge Protection Page Introduction OverviewFeatures and Specifications IntroductionSpecifications A50/A51 with Mounting Kit Package Check List Introduction Installation Procedure Switch Function DescriptionLED Indicators Switch settings table of SW1 and SW2 is as followsRS-422/RS-485 Pinouts A50/A51 RJ-45 Jack Terminal Block Connector Pinouts Signals Chapter Operation Wire Full Duplex Point-to-pointWire Half Duplex Multidrop SW1 DTE Simplex/Transmit, Receive A50/A51A50/A51 Self Test Operation Appendix a RS-232 Pinouts & Cable Wiring Appendix a RS-232 Pinouts and Cable Wiring Appendix a RJ-45 Connector DB-25 Female P e n dxi B Appendix B Impedance Matching and Termination Resistors Appendix C Troubleshooting Appendix C Troubleshooting Chapter Introduction Features A60 with Mounting Kit ~32~ Installation TxD indicator signal from local port RxD indicator signal from remote port ~36~ Ppendix a Appendix a ∙ RS-232 Pinouts and Cable Wiring ∙ ~40~ Ppendix B