Seaward DO5000 Interface Manual do Utilizador

REMOTE CONTROL INTERFACES FOR DO5000 SERIES DIGITAL MICROHMMETERS USER MANUAL Issue 7.0 1st October 2002 Cro

- 10 - MTA My Talk Address This is sent by a controller to indicate that it will be the talker from now on. All other bus devices must “un-talk” on

- 11 - 4. PROGRAMMING THE RS-232 & IEEE INTERFACES 4.1 Introduction These interfaces are programmed in a common language which is based on SCPI

- 12 - Query (?) Commands ending in a query (?) indicate that a response is expected from the instrument. This is usually a measured value or status

- 13 - Input Data Format Numeric data sent to the instrument should be in Ohms or degrees unless stated otherwise. The value can be in any standard s

- 14 - Input Buffer The instrument receives messages into an input buffer and only starts executing commands after receipt of a message terminator. T

- 15 - DO5003: <range> 3OHM (3 Ohm) 30OHM (30 Ohm) 300OHM (300 Ohm) 3KOHM (3 KOhm) 30KOHM (30 KOhm) AUTO1 (Autorang

- 16 - SOURce:CURRent? Returns the measuring current magnitude and mode currently in force. The response is of the following form: <magnitude&g

- 17 - INITiate:CONTinuous? Returns “0” (OFF) or “1” (ON). READ[:FRESistance|:TEMPerature|:TCOMpensate]? Triggers and returns a measurement. It is id

- 18 - DATAlogger:STEP Forces a single measurement only, which is stored in the next datalog location. The microhmmeter then returns to single trigger

- 19 - CALCulate:LIMit:UPPer? Returns the upper measurement limit in Ohms. CALCulate:LIMit:STATe <ON|OFF> or <1|0> Enables or disables th

- 2 - MANUAL HISTORY Issue 2.0 ECN 114 1/3/2000 First draft for RS-232 only. Not released. Issue 3.0 ECN 128 6/4/2000 Includes IEEE-488 int

- 20 - Filter (Averaging) Group SENSe:AVERage:STATe <ON|OFF> or <1|0> Enables or disables the filter (rolling average) facility. SENSe:

- 21 - SOURce:VOLTage:LIMit:LEVel? Returns “0” (OFF), “20” (20mV) or “50” (50mV). The DO5003 does not have this facility, and sending this query wil

- 22 - The default conditions that are forced are: Range: 30KOHM, AUTO1 Current: 100%, +I Read Rate: SLOW Trigger Mode: CONT:OFF (Single),

- 23 - Questionable Data Reg Condition Event Enable Bit Register Reg Reg

- 24 - This reporting system follows the style of SCPI, and the unused bits are allocated to other functions which allow for expansion and compatibili

- 25 - Command Error (bit 5) This bit is set when the command line is not recognised by the parser. This could be an invalid command, parameter or syn

- 26 - Status Byte Registers The Status Byte Register contains summary bits from the Questionable Data, Standard Event and Operation Registers, and a

- 27 - The following commands are used to access these registers; *STB? Query the Status Byte Summary Register. The instrument returns a decimal valu

- 28 - Example Data logging can take an appreciable time to execute, so it is useful to program the instrument to generate a service request on compl

- 29 - 5. PLC INTERFACE 5.1 Connection Connection to the PLC or similar device is made via the 25-way ‘D’ connector on the rear panel. See Appendix I

- 3 - CONTENTS 1. INTRODUCTION ...

- 30 - Logic states: Input - High state DC or AC voltage with an amplitude between Vmin & Vmax Input - Low state no voltage Output - High state

- 31 - EOT End of Test. This is asserted when a measurement cycle is completed. PASS If the measurement limits are in use, then this signal will be

- 32 - The PLC interface uses SINGLE trigger mode only. If a set-up memory which has CONTINUOUS trigger mode stored is selected when using the PLC int

- 33 - Figure 1 - Initial measurement using Memory 5 - Test failed, resistance too high Figure 2 - Subsequent measur

- 34 - Figure 3 - Connecting the unit with the internal supply + - 25V CTRLIN (4) N0 (

- 35 - Figure 4 - Connecting the unit with an external supply + - 25V CTRLIN (4) N0 (1

- 36 - APPENDIX I RS-232/IEEE-488 COMMAND SUMMARY Single Wire Interface Messages (IEEE-488 Only) DAV Data Valid NRFD Not Ready For Data NDAC

- 37 - Data Operation Commands DATAlogger: CLEAr COUNt <No. of readings> COUNt? STATe <ON|OFF> or <1|0> STATe? STARt

- 38 - Settling Algorithm Commands SENSe: SETTling:STATe <ON|OFF> or <1|0> SETTling:STATe? SETTling:COUNt <No. of readings>

- 39 - RS-232 Interface Commands SYSTem :LOCal :REMote

- 4 - 1. INTRODUCTION Two different types of Remote Interface permit full remote control of the microhmmeter by an external computer using either th

- 40 - APPENDIX II RS-232 Pin Connections 1 DCD Data Carrier Detect (not connected) 2 RXD Received Data (input) 3 TXD Transmitted

- 41 - APPENDIX IV PLC Pin Connections 1 No Connection 2 0VDC 3 +25VDC 4 CTRLIN 5 N1 6 N3 7 MEASURE 8 COM OUT

- 5 - If a 3-wire (TXD, RXD, GND) connection is to be used, connect RTS to CTS at the microhmmeter end. But take care; sending characters too quickly

- 6 - 3. IEEE-488 PARALLEL INTERFACE 3.1 Connection This conforms to specification ANSI/IEEE Std 488.1-1987 "Digital Interface for Programmabl

- 7 - TE0 Extended Talker Capability Extended talker addressing is not implemented. L3 Listener Capability The device; can act as a basic liste

- 8 - The 5 General Interface Management Lines are; REN Remote Enable This is used only by the System Controller to enable devices to be subsequent

- 9 - GET Group Execute Trigger This causes all devices which have the GET capability and are currently addressed to listen to initiate a pre-progr