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B&B Electronics 485T manual

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Table of contents for the manual

  • Page 1

    Docum ent ation Num ber 485T1995 Manual Cover Page B&B Electronics -- P O Box 1040 -- Ottaw a, IL 61350 PH (815) 433-5100 -- FA X (815) 433-5105 RS-422/RS-485 Line T ester Model 485T Docum ent ation Nu m ber 485T1995 This pr oduct Designed and M anufact ured In Ottawa , Illinois USA of do mestic and im porte d parts by B&B Electroni cs Mfg.[...]

  • Page 2

    Docum ent at ion Number 485T1995 Manual Table of Content s i B&B Electronics -- P O Box 1040 -- Ottaw a, IL 61350 PH (815) 433-5100 -- FA X (815) 433-5105 TA BLE OF CONTENTS INTRODUCT ION ............................................................................... 1 RS-422 A ND RS-485 STANDA RDS ..............................................[...]

  • Page 3

    Docum ent ation Num ber 485T1995 Manual 1 B&B Electronics -- P O Box 1040 -- Ottaw a, IL 61350 PH (815) 433-5100 -- FA X (815) 433-5105 INTRODUCTIO N The Model 485T Tes ter can be used to c heck the condition of signals at any node on an RS-422 or RS-485 network. T he tester determ ines if the m axim um perm issible negative or positive voltage[...]

  • Page 4

    2 Documentation Num ber 485T1995 Manual B&B Electronics -- P O Box 1040 -- Ottaw a, IL 61350 PH (815) 433-5100 -- FA X (815) 433-5105 high and vice-vers a. Also, the drivers are capable of driving a wire with as muc h as 25 tim es m ore capacitanc e before the s ignal is badly distorted. Mos t system designer s try to minim ize the number of si[...]

  • Page 5

    Docum ent ation Num ber 485T1995 Manual 3 B&B Electronics -- P O Box 1040 -- Ottaw a, IL 61350 PH (815) 433-5100 -- FA X (815) 433-5105[...]

  • Page 6

    4 Documentation Num ber 485T1995 Manual B&B Electronics -- P O Box 1040 -- Ottaw a, IL 61350 PH (815) 433-5100 -- FA X (815) 433-5105[...]

  • Page 7

    Docum ent ation Num ber 485T1995 Manual 5 B&B Electronics -- P O Box 1040 -- Ottaw a, IL 61350 PH (815) 433-5100 -- FA X (815) 433-5105[...]

  • Page 8

    6 Documentation Num ber 485T1995 Manual B&B Electronics -- P O Box 1040 -- Ottaw a, IL 61350 PH (815) 433-5100 -- FA X (815) 433-5105 CONTROLS A ND CONNECTIONS ON THE 485T A and B Terminals The two signal lines us ed in an RS-422 or RS-485 network should be labeled A and B. T hese lines should be c onnected to the A and B term inals of the 485T[...]

  • Page 9

    Docum ent ation Num ber 485T1995 Manual 7 B&B Electronics -- P O Box 1040 -- Ottaw a, IL 61350 PH (815) 433-5100 -- FA X (815) 433-5105 Threshold Pot The large pot in the c enter of the 485T is the thres hold pot. In order f or RS-422/485 to work properly, y ou should have a differ ential input voltage of m ore than .2 volts ac ross the two lin[...]

  • Page 10

    8 Documentation Num ber 485T1995 Manual B&B Electronics -- P O Box 1040 -- Ottaw a, IL 61350 PH (815) 433-5100 -- FA X (815) 433-5105 RS-422/RS-485 Sw itch This switch controls the positive threshold voltage f or the Positive Thr eshold LED only. W hen the switch is in the RS-422 position, the positive thres hold is +7 volts. W hen it is in the[...]

  • Page 11

    Docum ent ation Num ber 485T1995 Manual 9 B&B Electronics -- P O Box 1040 -- Ottaw a, IL 61350 PH (815) 433-5100 -- FA X (815) 433-5105 RS-422/485 TEST A ty pical test on an RS- 422/485 network m ight go lik e this: First start by locating the two wi res us ed for the RS-422/485 network and try to determine which is A and which is B. Also, loca[...]

  • Page 12

    10 Docum ent ation Num ber 485T1995 Manual B&B Electronics -- P O Box 1040 -- Ottaw a, IL 61350 PH (815) 433-5100 -- FA X (815) 433-5105 See B&B Electronics ' fr ee RS-422/485 Application Note for inform ation on proper wiring and grounding of an RS-422/485 network. If the POSIT IVE and NEGAT IVE THRESHO LD LEDs are both off , y ou can[...]

  • Page 13

    Docum ent ation Num ber 485T1995 Manual 11 B&B Electronics -- P O Box 1040 -- Ottaw a, IL 61350 PH (815) 433-5100 -- FA X (815) 433-5105 You can then use the 485T T ester to m onitor the data that is being sent or rec eived on y our network. If you have a datascope or a com puter running a datasc ope-lik e program y ou can connect it to the RS-[...]

  • Page 14

    12 Docum ent ation Num ber 485T1995 Manual B&B Electronics -- P O Box 1040 -- Ottaw a, IL 61350 PH (815) 433-5100 -- FA X (815) 433-5105[...]