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B&B Electronics 485T Manual

Manual is about: RS-422/RS-485 Line Tester

Summary of 485T

  • Page 1

    Documentation number 485t1995 manual cover page b&b electronics -- po box 1040 -- ottawa, il 61350 ph (815) 433-5100 -- fax (815) 433-5105 rs-422/rs-485 line tester model 485t documentation number 485t1995 this product designed and manufactured in ottawa, illinois usa of domestic and imported parts ...

  • Page 2: Table of Contents

    Documentation number 485t1995 manual table of contents i b&b electronics -- po box 1040 -- ottawa, il 61350 ph (815) 433-5100 -- fax (815) 433-5105 table of contents introduction ...............................................................................1 rs-422 and rs-485 standards ...............

  • Page 3: Introduction

    Documentation number 485t1995 manual 1 b&b electronics -- po box 1040 -- ottawa, il 61350 ph (815) 433-5100 -- fax (815) 433-5105 introduction the model 485t tester can be used to check the condition of signals at any node on an rs-422 or rs-485 network. The tester determines if the maximum permissi...

  • Page 4

    2 documentation number 485t1995 manual b&b electronics -- po box 1040 -- ottawa, il 61350 ph (815) 433-5100 -- fax (815) 433-5105 high and vice-versa. Also, the drivers are capable of driving a wire with as much as 25 times more capacitance before the signal is badly distorted. Most system designers...

  • Page 5

    Documentation number 485t1995 manual 3 b&b electronics -- po box 1040 -- ottawa, il 61350 ph (815) 433-5100 -- fax (815) 433-5105.

  • Page 6

    4 documentation number 485t1995 manual b&b electronics -- po box 1040 -- ottawa, il 61350 ph (815) 433-5100 -- fax (815) 433-5105.

  • Page 7

    Documentation number 485t1995 manual 5 b&b electronics -- po box 1040 -- ottawa, il 61350 ph (815) 433-5100 -- fax (815) 433-5105.

  • Page 8

    6 documentation number 485t1995 manual b&b electronics -- po box 1040 -- ottawa, il 61350 ph (815) 433-5100 -- fax (815) 433-5105 controls and connections on the 485t a and b terminals the two signal lines used in an rs-422 or rs-485 network should be labeled a and b. These lines should be connected...

  • Page 9

    Documentation number 485t1995 manual 7 b&b electronics -- po box 1040 -- ottawa, il 61350 ph (815) 433-5100 -- fax (815) 433-5105 threshold pot the large pot in the center of the 485t is the threshold pot. In order for rs-422/485 to work properly, you should have a differential input voltage of more...

  • Page 10

    8 documentation number 485t1995 manual b&b electronics -- po box 1040 -- ottawa, il 61350 ph (815) 433-5100 -- fax (815) 433-5105 rs-422/rs-485 switch this switch controls the positive threshold voltage for the positive threshold led only. When the switch is in the rs-422 position, the positive thre...

  • Page 11: Rs-422/485 Test

    Documentation number 485t1995 manual 9 b&b electronics -- po box 1040 -- ottawa, il 61350 ph (815) 433-5100 -- fax (815) 433-5105 rs-422/485 test a typical test on an rs-422/485 network might go like this: first start by locating the two wires used for the rs-422/485 network and try to determine whi...

  • Page 12

    10 documentation number 485t1995 manual b&b electronics -- po box 1040 -- ottawa, il 61350 ph (815) 433-5100 -- fax (815) 433-5105 see b&b electronics' free rs-422/485 application note for information on proper wiring and grounding of an rs-422/485 network. If the positive and negative threshold led...

  • Page 13

    Documentation number 485t1995 manual 11 b&b electronics -- po box 1040 -- ottawa, il 61350 ph (815) 433-5100 -- fax (815) 433-5105 you can then use the 485t tester to monitor the data that is being sent or received on your network. If you have a datascope or a computer running a datascope-like progr...

  • Page 14

    12 documentation number 485t1995 manual b&b electronics -- po box 1040 -- ottawa, il 61350 ph (815) 433-5100 -- fax (815) 433-5105.