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ATEN Technology RS-485 manual

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Table of contents for the manual

  • Page 1

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  • Page 2

    FCC Information This equipme nt has been tes ted and found to comply with the limits for a Class B d igital d evice, purs uant to Part 1 5 of the FCC Ru les. These lim its are designed t o provide rea sonable pr otection aga inst harmful interfer ence in a residenti al installa tion. This equi pment generates, uses and c an radiat e radio fre quenc[...]

  • Page 3

    - 3 - ic485ai User Manu al Online Registration T elephone Sup port T echnical Support  For international online technical support – i ncluding troubleshooting, documentation, and software updates: http://support. aten.com  For North American technical support: International h ttp://support .aten.com North America http://www .aten-usa.com/pr[...]

  • Page 4

    - 4 - Pa c k a g e C o n t e n t s The RS232 / RS485 Interface Converter package contains the following items:  1 IC485AI Bidirectional Isolate d Converter  1 Power Adapter  1 User Manual Check to make sure t hat all the components are present and that nothing got damaged in shipping. If you encounter a problem, contact your dealer . Read [...]

  • Page 5

    - 5 - Overview Although RS-232 serial ports are found on almost every computer , becau se of their slow transmission speeds, limited range, and limi ted networking capabilities, they are not an effective solution for industrial strength long distance communications systems. Systems based on the RS-422 a nd RS-485 standards, on the other hand, are n[...]

  • Page 6

    - 6 -  Cable distance of up to 1200 m (4000 ft.)  Compact size Components T op view: 1. S tatus LEDs  RTS: Lights to indicate that R TS has been pulled high.  TxD: Flashes when data transmission occurs. 2. RS-422 / RS-485 T erminal Block 3. Grounding T ab 4. DCE /DTE Selectio n Switch If the IC-485AI is going to be plugged into a DTE de[...]

  • Page 7

    - 7 - Bot tom V iew: 1. DIP Switch This eight segment DIP Switch, located on the unit’s bottom panel, is used to configure the switch’s operating p arameters. 1[...]

  • Page 8

    - 8 - DIP Switch Configuration The IC-485AI’s settings for Baud Rate, Data Format, and RS-422 / RS-485 Mode are configured b y setting the eight se gment DIP Switch located on its bottom panel Note: When you change any of the DIP Switch settings, you must reset the device by pow ering it off, then powering it on again.  SW 1-3: Baud Rate Note:[...]

  • Page 9

    - 9 -  SW 5-6: Data Format These two switch segments configure the bit settings for S tart, Data, Parity , and S top. Note: The default is 10 bits (1 Start; 8 Data; 0 Parity; 1 Stop). Unless you have a special reason to change this, we recommend that you leave it as is. If you do change it, however, all the units on the in stallation must be cha[...]

  • Page 10

    - 10 - Operating Modes The IC-485AI supports three operating modes: Point-to-Point; Multidrop; and Simplex. Point-to-Point and Mu ltidrop can be configured for Fu ll or Half Dupl e x. Each of the operating modes is explained below . Point-to-Point A Point-to-Point configuration is one in which two devices, located at two different places are linked[...]

  • Page 11

    - 11 - 2. Point-to-Point 2 Wire Half Duplex  Point-to-Point Half Duplex uses straight through two wire cabling, as shown in the diagra m below .  For both IC-485AI units, set the unit to DCE or DTE depending on what type of devi ce the IC-485AI will plug into (if it will plug into a DCE device, configure it for DTE, and vice versa).  Set S[...]

  • Page 12

    - 12 - 1. Multidrop Full Duplex  Multidrop Full Duplex uses reverse fo ur wire cabling, to link all the connected IC-485AI units:  For all IC-485AI units, set the unit to DCE or DTE depending on what type of devi ce the IC-485AI will plug into (if it will plug into a DCE device, configure it for DTE, and vice versa).  For the Master unit, [...]

  • Page 13

    - 13 - 2. Multidrop Half Duplex  Multidrop Half Duplex uses reverse two w ire cabling, to link all the connected IC-485AI units:  For all IC-485AI units, set the unit to DCE or DTE depending on what type of devi ce the IC-485AI will plug into (if it will plug into a DCE device, configure it for DTE, and vice versa).  For all of the units s[...]

  • Page 14

    - 14 - Simplex A Simplex configuration is one in which more than two devices are linked for commu nication using several IC-485AI units in a manner similar to Multidrop. The difference is that in a Simplex configuration, the Master device can only talk, and the Slave devices can only listen.  Simplex uses reverse two wire cabli ng to link all th[...]

  • Page 15

    - 15 - Installation 1. Make sure that all the devices you will be connecting up are powered of f. 2. Set each IC-485AI’s configuration switches accordin g to the information provid ed in the Switch Configuration and Operating Modes sections. 3. Plug the IC-485AI’s DB-25 female connector into the computer’s RS-232C por t. 4. Connect the IC-485[...]

  • Page 16

    - 16 - RS-422 / RS-485 Inst alla tion Diagr ams RS-422 Full Duplex Note: When the distan ce between both ends of the installation is large and/o r the transmitted si gnals are unstable, insert 120 Ω terminal resistors between pins 1 and 2 an d between pins 3 and 4 on the terminal blo cks of the two units at each en d of the instal lation. RS-485 H[...]

  • Page 17

    - 17 - Appendix T erminal Block Pin As signments Circuit T est T o test the IC-485AI’s internal circuits, connect a dumb terminal to the unit and do the following: 1. Set the DCE / DTE switch to the opposite of the terminal. 2. Set all DIP Sw itch segments to ON . 3. Connect one wire from Tx+ (1) to Rx+ (4); connect a second wire from Tx- (2) to [...]

  • Page 18

    - 18 - RS-485 Oper a tion Mode Flow Char ts RTS Co n tr o l M o de  The IC-485AI operates in RS-4 85 RTS Control Mode when both SW7 and SW8 are set to OFF .  In this mode, RTS is pulled high when the computer makes a request to send data. Star t RTS=0 Send RTS=1 Send Data Complete No Ye s Receive Receive Data Complete No No Ye s No Ye s Ye s[...]

  • Page 19

    - 19 - Au t o S en d D at a M o d e  The IC-485AI operaties in RS-485 Auto Send Data Mode when SW7 is set to OFF , and SW8 is set to ON .  In this mode, the status of t he bus li ne is auto-detected in order to prevent more than one signal on the line.  If the the bus line is busy , CTS is pulled high, and the IC- 485AI will not send data [...]

  • Page 20

    - 20 - DCE / DTE Connection Description  D CE  DTE  DCE DTE  DB- 9  DB-9  DB-25  DB-25  1 1 (PG) 1 1  2 3  3 2 2 3  3 2 2 3 3 2  8 7 5 4 4 5  7 8 4 5 5 4  6 6 6 6 (DSR) 6 6  5 5 7 7 SG?[...]

  • Page 21

    - 21 - Specifica tions Function Specification Power Consumption DC 9V ; 900mW (max.) Data Rate Up to 1 15.2 Kbps under 1200 m (4000 ft.) Connectors 1 x DB-25 female (RS-232); 1 x 4 Post T erminal Block (RS-422 / RS-485); 1 x Grounding T ab Function Switches Slide Switch DCE / DTE Select DIP Switch Segment 1-3: Baud Rate; Segment 4: Reserved; Segmen[...]

  • Page 22

    - 22 - T roubleshooting Limited W arr anty IN NO EVENT SHALL THE DIRECT V E NDOR’S LIABILITY EXCEED THE PRICE PAID FOR THE PRODUCT FROM THE DIRECT, INDIRECT, SPECIAL, INCIDENTAL OR CONSEQ UENTIAL DAMAGES RESULTING FROM THE USE OF THE PRODUCT, DISK OR ITS DOCUMENTATION. The direct vendor makes no warranty or rep resentation, expressed, implied, or[...]