Related Manuals for Brainboxes AD-1200 H
Summary of Contents for Brainboxes AD-1200 H
- Page 1 ADMUX Reference ADMUX AD1200 Relay Multiplexer Board 1.00 EDITION MAY 1994 Intro-1...
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Page 2: Table Of Contents
_______________ _ Outline Contents. Chapter 1. Analog Relay Multiplexer Terminal Board. ______________________________________________ _ Chapter 1. Analog Relay Multiplexer Terminal Board. Introduction. The Relay Multiplexer Terminal Board. Card Address DIP Switches. AD1200 Input Channel Select Jumpers. Relay Made Feedback Select Jumpers. ADCLOCK Jumper. - Page 3 ADMUX Reference Figure 1-6. Relay Made Feedback Jumper. Figure 1-7. ADCLOCK Jumper. Figure 1-8. Activating Cold Junction Compensation. Figure 1-9. Gain Selection. Figure 1-10. VOPT Selection. Figure 1-11. AD1200 Register Map. Figure 1-12. A/D Control Status Register. Figure 1-13. DIGOUT Output Register. Figure 1-14.
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Page 4: Introduction
Analog Relay Mux Board ANALOG RELAY MULTIPLEXER TERMINAL BOARD. Introduction. ___________ _ This manual explains the functions and features of the Analog Relay Multiplexer Terminal Board for the AD1200 series of cards. The Relay multiplexer card expands the input capability of the AD1200 card from only 8 differential channels up to a maximum of 1,920 Differential input channels. -
Page 5: The Relay Multiplexer Terminal Board
Reference Analog Relay Mux Board The first wire goes from (underneath side of the card ) the square pad, pin 1, of the channel select header strip to the square pad on the screw terminal strip. The second wire goes from the pad next to the square pad, pin 3, of the channel select header strip to the pad next to the square pad on the screw terminal strip. - Page 6 Analog Relay Mux Board _____________________________ Figure 1-1. AD1200 Card Layout. Original Version Without ISO122 Amp. STACK RELAY 0 0 1 2 3 4 5 6 7 8 9 A B C D E F JUMPERS R2 1234 POT R23 CARD ADDRESS STACKING ROD RELAY 15...
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Page 7: Figure 1-2. Ad1200 Card Layout
Reference _____________________________ Figure 1-2. AD1200 Card Layout. Updated Version With ISO122 Amp. STACK RELAY 0 0 1 2 3 4 5 6 7 8 9 A B C D E F JUMPERS R2 1234 POT R23 CARD ADDRESS STACKING ROD The Analog Screw Terminal Board converts from the 50 IDC ribbon cable to screw terminals, making all the AD1200 pinouts easily accessible. -
Page 8: Card Address Dip Switches
Analog Relay Mux Board Twin 50 way D connector ribbon cables allows for easy daisy chaining of multiple boards. Card Address DIP Switches. ________________________ _ The Card Address DIP switches t jumpers determine to which channel on the PC A/D card the output of the relays is routed. -
Page 9: Ad1200 Input Channel Select Jumpers
Reference AD1200 Input Channel Select Jumpers. __________________________________ The AD1200 input channel select jumpers determine to which channel on the PC A/D card the output of the relays is routed. The A/D conversion are then performed with this channel selected on the PC AD1200 card. Since the relays are switching differential signals two jumpers are used to select A/D input channel, the Channel and its return line. -
Page 10: Adclock Jumper
Analog Relay Mux Board Input Bit 0 etc. Figure 1-6. Relay Made Feedback Jumper. ____________________________________ _ JUMPER ______ LABEL _____ _____ LABEL INCORRECT RIGHT __________________ ADCLOCK Jumper. The AD1200 series cards have an external clock input line EXT CLOCK, that can be used to strobe A/D conversions when the card is in mode 3. -
Page 11: Cold Junction Compensation
Reference Cold Junction Compensation. _________________________ _ The ADMUX card has on board cold junction compensation circuitry. When the two jumper links are connected the Cold Junction Circuit is connected to Relay 0 on the ADMUX board. When the two jumper links are removed then Relay 0 is free for use as a normal input. -
Page 12: Calibrating The Cold Junction
Analog Relay Mux Board Example: AD1200 card jumper set range of 0-10 Volts unipolar. Gain of 1000 is selected for Channel 0 Ambient temperature of 18 degrees Centigrade Thus CJC circuit gives a voltage of 18 x 0.5 mV = 9mV. 9mV input Channel 0 at gain of 1000 equivalent to 9 Volts 9 Volts on 0-10V i/p range is 9*4096/10= 3686= E66hex To convert a reading into a temperature in degrees Centigrade... -
Page 13: Resistors R1, R2, R3 And R4
Reference Resistors R1, R2, R3 and R4. _________________________ There is provision for adding four optional resistors to the ADMUX card. R1 Precision 250 Ohms resistor. Fit this when using the ADMUX card with 4-20m Amp differential current inputs. Omit for thermocouple use. R2 Nominally 10k Ohms Fit with 10k nominal resistor to provide differential return path to analog ground. -
Page 14: Low Pass Filter, R15 And C28
Analog Relay Mux Board Jumper W4 connects the AMPLOW to the ANALOG ground. Pseudo differential inputs are referenced to AMPLOW. This jumper can be used in conjunction to W3 to connect AMP LOW to the system ground SYS GND. Low Pass Filter, R15 and C28. __________________________ The input to the programmable gain amp passes through a low pass filter formed by R15 and C28. -
Page 15: Pull Up/ Pull Down- Open Circuit Detection
Reference Figure 1-9. Gain Selection. _______________________ GAIN Gain Selected _____ _ ____________ Gain 1 Gain 10 Gain 100 Gain 1000 Pull Up/ Pull Down- Open Circuit Detection. ______________________________________ _ Open circuit inputs can be detected by the installation of resistors to pull the differential input lines to a known state The two VOPT jumpers can pull the INPUT+ line, via a 100k resistor R13, to isolated grounds or to the isolated +15volt supply. -
Page 16: Ad1200 Register Resume
Analog Relay Mux Board Figure 1-10. VOPT Selection. _________________________ _ VOPT Connection Of INPUT+ line. _____ _ ________________________ _ R13, 100k, pulls up to isolated +15volts. R13, 100k, pulls down to isolated Ground. R13 Disconnected, No open circuit detect on INPUT+. AD1200 Register Resume. -
Page 17: Bit 7 A/D Done, Read Only
Reference finished, its A/D Error and Clear Error bits are used to detect and service A/D overrun or triggering mistakes. The DMA and Interrupt enable bits are used to decide whether the A/D Done bit causes a DMA read or system interrupt. Finally its Mode bits determine whether single shot or continuous A/D conversions are performed and what initiates the repetitive conversions and at what rate they occur. -
Page 18: The A/D Gain Channel Register
Analog Relay Mux Board ____________________________ The A/D Gain Channel Register. The A/D Gain Channel Register, ADGCR, is used to select the input channel to the A/D converter and the gain applied to the input signal by the programmable gain amplifier. When in Mode 0, single conversion mode, then writing to the A/D Gain Channel Register forces the A/D Converter to start its next conversion. -
Page 19: Sample Programs
Reference low cause the corresponding DIGIN bit to read low. If on reading the DIGIN register a value of 0FFhex is obtained then all the TTL input lines where true. A reading of 00hex means that all lines were low. A reading of 01hex means that only DIGIN line 0 was high, all the rest are low. -
Page 20: Figure 1-15. Sample Basic Program
Analog Relay Mux Board Figure 1-15. Sample Basic Program. _______________________________ 10 BASE=&H218: 11 W=2500: 12 ADCSR=BASE :ADGCR=BASE+1 :ADCLO=BASE+2 :ADCHI=BASE+3 13 DIGIN=BASE+6 :DIGOUT=BASE+6: REM Digital i/o ports at same address 14 FEED=&H1 :REM Relay Made Feedback Jumper Set To Bit 0 15 : 16 : 20 FOR RELAY = 0 TO 15... -
Page 21: Figure 1-16. Relay Mux J1 & J2 Pin Outs
Reference ____________________________________ Figure 1-16. Relay Mux J1 & J2 Pin Outs. Signal AD Ch 0 AD Ch 1 AD Ch 2 AD Ch 3 AD Ch 4 AD Ch 5 AD Ch 6 AD Ch 7 Analogue Gnd 17 ------------------------------------------------------------- +12Volts Out 19 ------------------------------------------------------------- Power Ground 21... - Page 22 Index ADMUX Reference Index. _____ _ A/D control status reg...13, 14 A/D Done ... 13, 14 A/D error ... 14 A/D gain channel reg...15 ADC...3, 6, 9, 14 ADCHI /LO...13, 16 ADCSR...13, 14 ADGCR... 13, 15, 16 Base address... 17 Cables...
- Page 23 ADMUX Reference Make... 6, 16 Mode 0...15 Mode 3...7 Multiplexer... 1, 2 Multiplexing... 1 Mux ... 5, 16, 18 Power...14, 18 Programmable gain...11, 15 Pseudo differential...11 Register map...13 Screw terminal board...4 Single conversion... 15 Single ended... 10 Strobe...7 Temperature...8, 9, 11 Thermocouple...4, 8, 10 TIMER...13 Trigger...