Sensoray 118 - Manual (Page 2)

Sensoray Model 118 Smart A/D™ Instruction Manual Table of Contents
Table of Contents
Prolog
1.1 Limited Warranty ............................. 1
1.2 Special Handling Instructions .......... 1
Introduction
2.1 Functional Description ...................... 2
2.2 Block Diagram ................................... 2
2.3 Board Layout ..................................... 3
2.4 Reset State .......................................... 3
2.5 Fault Indicator ................................... 3
Hardware Configuration
3.1 Base Address ...................................... 4
3.2 Signal Conditioning Circuit (SCC) .. 4
3.2.1 Side Effects...........................4
3.2.2 Recommended Settings ........4
3.2.3 Shunt Mapping .....................5
Connections
4.1 Overview............................................. 6
4.1.1 Termination Boards ..............6
4.1.2 Sensor Hot Insertion .............6
4.2 Connector Pinout............................... 6
4.2.1 Reference Junction Sensor ...6
4.3 Sensor Channels ................................ 6
4.3.1 Sense Terminals ...................6
4.3.2 Excitation Terminals ............6
4.3.3 Shield Terminal ....................7
4.4 RTDs, Resistors and Thermistors .... 7
4.4.1 Two-wire Circuit ..................7
4.4.2 Three-wire Circuit ................7
4.4.3 Four-wire circuit...................7
4.4.4 Recommended Practice ........7
4.5 DC Voltage Sources........................... 8
4.5.1 Recommended Practice ........8
4.6 Thermocouples................................... 8
4.6.1 Recommended Practice ........8
4.7 Strain and Pressure Gages................ 8
4.7.1 Recommended Practice ........8
4.8 4-to-20 mA Current Loops ............... 9
Programming
5.1 Programming Model ......................... 10
5.1.1 Handshake Mechanism.........10
5.2 Commands ......................................... 11
5.2.1 Opcodes ................................11
5.2.2 Conventions..........................11
5.3 Low Level Drivers ............................. 11
5.3.1 Manifest Constants ............... 11
5.3.2 Sample Drivers ..................... 12
Commands
6.1 Board Configuration..........................14
6.1.1 GetProductID ....................... 14
6.1.2 GetFWVersion ..................... 15
6.1.3 SetHiSpeedMode.................. 16
6.1.4 SetReject50Hz ...................... 17
6.2 Channel Configuration ......................18
6.2.1 SetSensorType...................... 18
6.2.2 SetFailMode ......................... 19
6.2.3 SetFilter ................................ 20
6.2.4 SetCoefficients ..................... 21
6.3 Sensor Acquisition .............................22
6.3.1 GetSensorData...................... 22
6.3.2 GetAllSensors....................... 23
6.3.3 GetAmbientTemp................. 24
6.4 Pressure/Strain Gage .........................25
6.4.1 SetGageTare ......................... 25
6.4.2 SetGageZero......................... 26
6.4.3 SetGageSpan ........................ 27
6.4.4 GetGageCal .......................... 28
6.4.5 SetGageCal........................... 29
6.5 Alarms .................................................30
6.5.1 SetAlarmLimits .................... 30
6.5.2 GetAlarms ............................ 31
Theory of Operation
7.1 Firmware ............................................32
7.1.1 Digitizer................................ 32
7.1.2 Cruncher ............................... 32
7.1.3 Command Processor............. 32
7.2 Analog Circuits...................................32
7.2.1 Measurement Section ........... 32
7.2.2 Excitation Section ................ 32
Timing
8.1 Slot Time .............................................33
8.2 Update Rate ........................................33
8.2.1 Primary Influences ............... 33
8.2.2 Secondary Influences ........... 33
8.3 Data Age..............................................34
8.3.1 Example................................ 34
8.4 Communication Latency ...................34
Specifications
9.1 General Specifications .......................35
9.2 Sensor Specifications .........................36