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SDS-122

Serial Data Switch

User Guide

Issued 1.8.01

Copyright



2001 Campbell Scientific Ltd.

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Содержание SDS-122

Страница 1: ...SDS 122 Serial Data Switch User Guide Issued 1 8 01 Copyright 2001 Campbell Scientific Ltd ...

Страница 2: ......

Страница 3: ...eglect accidents of nature or shipping damage This warranty is in lieu of all other warranties expressed or implied including warranties of merchantability or fitness for a particular purpose CSC is not liable for special indirect incidental or consequential damages Products may not be returned without prior authorization To obtain a Return Merchandise Authorization RMA contact CAMPBELL SCIENTIFIC...

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Страница 5: ...s 9 Figures 1 General View of SDS 122 1 2 Pin Positions for Datalogger Port 9 way Male D Type Connector 2 3 Pin Positions for Switched Datalogger Port B 9 way Female D Type Connector 3 4 Pin Positions for Switched RS232 Port A 25 way Female D Type Connector 4 5 Default Jumper Positions on Circuit Board 7 6 Jumper Positions for a RAD SRM Short Haul Modem on Port A 8 Tables 1 Current Consumption in ...

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Страница 7: ...munications The SDS 122 can support both DTE and DCE devices without the need for a null modem cable and can emulate an SC932 9 pin to RS232 DCE interface One port of the SDS 122 can also be configured to emulate an optically isolated SC32A interface in either DCE or DTE mode A jumper switch is provided for use with CR500 510 CR10 10X and CR23X dataloggers to block the transmission of synchronous ...

Страница 8: ...cation activity 9mA Non Isolated RAD SRM communicating with PC208E or TCOM in Monitor Mode 12mA Non Isolated Jumper PL50 not fitted RAD SRM connected but no communication activity This is the one way print enabled RAD SRM mode 100µA Normal Operating Temperature Range 25 C to 50 C For extended temperature range requirements please contact Campbell Scientific 2 3 Port Configuration Connections The S...

Страница 9: ...vent switching to the other port Switched Datalogger Port B Figure 3 Pin Positions for Switched Datalogger Port B 9 way Female D Type Connector The switched datalogger port marked PORT B in Figure 1 is a 9 way female D type connector having the following pin configuration PIN ABBREVIATION I O 1 5V 2 0V 3 RING I 4 RX I 5 ME O 6 SDE PE O 7 CLK HS O 8 Connected to pin 8 of the datalogger port 12V sup...

Страница 10: ...crewed connections This terminal block can be unplugged from the unit for ease of wiring The terminal connections are marked G P and M and are used as follows TERMINAL CONNECTION G 0V It is recommended that a wire is run from this terminal to the main protective earth point in the system to give maximum protection from interference and transients P In MANUAL mode this terminal can be pulled high t...

Страница 11: ... Short Haul modems fitted with RAD SP lightning arrestors should be used 4 Configuration The configuration of the SDS 122 is defined by internal jumpers To access these jumpers it is necessary to open the case by removing the four case screws and pulling the two halves of the case apart Before touching any components or jumpers take precautions against electrostatic damage when handling the expose...

Страница 12: ...r Care should be taken when selecting third party devices to ensure that they provide some form of barrier to prevent ground loops 4 1 Jumper Configuration It is envisaged that most applications will be with a telephone modem connected to Port B and a personal computer connected directly to Port A The SDS 122 as supplied has its jumpers set to this default configuration please see Figure 5 When us...

Страница 13: ...User Guide 7 Figure 5 Default Jumper Positions on Circuit Board CONN 4 OPEN OPEN OPEN OPEN OPEN OPEN OPEN ...

Страница 14: ...SDS 122 Serial Data Switch 8 Figure 6 Jumper Positions for a RAD SRM Short Haul Modem on Port A OPEN OPEN OPEN OPEN CLOSED OPEN OPEN CHANGE TO DTE CHANGE TO POWERED TURN 180 TURN 180 ...

Страница 15: ... transmitted e g to a storage module the SDS 122 will block any data output to port A When PL44 is not fitted all data is allowed to pass through to port A SW1 5 DCE Jumper block SW1 5 can be set so that port A can operate as either a DCE or DTE interface and so there is no requirement for a null modem cable The DCE and DTE jumper positions are marked on the PCB Note that to change the settings th...

Страница 16: ...s has no effect in isolated mode PL51 Not fitted When jumper PL51 is fitted 7V is permanently output to pins 20 and 4 of port A in DTE mode and to pins 5 and 6 of port A in DCE mode This jumper is not normally fitted for RAD SRM modems in interactive communication When not fitted the outputs are shut off when ME goes low PL56 Not fitted When jumper PL56 is fitted 7V is supplied to the handshake li...

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