CONTENTS. 1.0 Introduction Description of the Circuit Installation Demonstration Examples 3

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1 1 CONTENTS PAGE NO 1.0 Introduction Description of the Circuit Installation Demonstration Examples Demonstration Program for MPS 85-3 Trainer Demonstration Program for ESA 85-2 Trainer Demonstration Program for ESA-80 Trainer Demonstration Program for ESA-65 Trainer Demonstration Program for ESA-31 Trainer Demonstration Program for ESA-68K Trainer Demonstration Program for ESA-196 Trainer Demonstration Program for ESA 86/88-2 Trainer Demonstration Program for ESA 68-2 Trainer Demonstration Program for ESA-51 Trainer Demonstration Program for ESA 86/88-3 Trainer Demonstration Program for ESA 51E Trainer Demonstration Program for ESA 86/88E Trainer Exercises 17 Appendix A : Component Layout Diagram Appendix B : Schematic Diagram

2 2 1.0 INTRODUCTION Electro Systems Associates Private Limited (ESA) manufactures trainers for most of the popular microcomputers viz 8085, Z-80, 6502, 8031, 8086/8088, and ESA offers a variety of modules which can be interfaced to these trainers. These modules can be effectively used for teaching/training in the laboratories. The Dual DAC interface can be used to generate different interesting waveforms using microprocessor. There are two eight bit digital to analog converters provided, based on DAC The digital inputs to these DACs are provided through the port A and port B of 8255 used as output ports. The analog output from the DACs are given to operational amplifiers which act as current to voltage converters. Two 10K ohms pots are provided for the offset balancing of opamps. The reference voltage needed for the DACs is obtained from a onboard voltage regulator ua723. The voltage generated by this regulator is about 8V. The outputs from the DACs vary between 0 to 5V corresponding to values between 00 to FF. Different waveforms can be observed at the opamp outputs depending upon the digital input patterns. 2.0 DESCRIPTION OF THE CIRCUIT Please refer to the schematics of this interface presented in Appendix B. As can be seen from the circuit only 17 lines from the connector are used totally. The port A and port B of 8255 programmable peripheral interface are used as output ports. The digital inputs to the DACs are provided through the port A and port B of The analog outputs of the DACs are connected to the inverting inputs of opamps ua741 which act as current to voltage converters. The outputs from the opamps are connected to points marked Xout & Yout at which the wave forms are observed on a CRO. (Port A is used to control Xout and Port B is used to control Yout). The reference voltage for the DACs is derived from an on-board voltage regulator ua723. It generates a voltage of about 8V. The offset balancing of the opamps is done by making use of the two 10K pots provided. The output waveforms are observed at Xout and Yout on an oscilloscope. 3.0 INSTALLATION The interface is housed in a plastic enclosure which has a locking mechanism. To open the cover, push in the locking mechanism with a finger and lift the cover to open.

3 The interface module has a 26-pin connector at one edge of the card. This is used for connecting the interface to the trainer with a flat cable connector set.

3 3 The interface module has a 26-pin connector at one edge of the card. This is used for connecting the interface to the trainer with a flat cable connector set. External power supplies +12V and -12V and GND are connected to points marked +12V and -12V and GND respectively on the DAC card through the 4 pin connector provided on the interface. Table 3-1 shows the connector on various trainers to which this interface can be connected. Some trainers have two connectors and either may be used for connecting this interface. The demonstration programs presented in this manual assume that the interface is connected to connector shown in column A. If the connector shown in column B is used, then user has to change the port addresses appropriately. User may refer to the component layout diagrams of respective ESA trainers to locate the connectors mentioned here. TABLE-3.1 MICROPROCESSOR A B TRAINER MPS85-3 J2 J1 ESA85-2 J2 J1 ESA-80 J2 J1 ESA-65 P4 ESA-68K P3 P4 ESA 68K-2 J2 J1 ESA 68-2 J1 J6 ESA 196 J1 J2 ESA-31 J2 J1 ESA-51 J10 J7 ESA-51E J5 J3 ESA-86/88-2 J4 J5 ESA-86/88-3 J8 J9 ESA-86/88E J4 J6 4.0 DEMONSTRATION EXAMPLES DESCRIPTION OF DEMO PROGRAM To use DAC initialise 8255 for Mode 0 with Port A and Port B as output. Output the data on the appropriate port, and observe the output waveform at 'Xout' and 'Yout' on an oscilloscope.

4 4 4.1 DEMONSTRATION PROGRAM FOR MPS 85-3 TRAINER ; Assume the interface is connected over J2 of the trainer. ; The trainer can be in KEYBOARD MODE or SERIAL MODE. ; Enter the following sample program and execute the program ; using 'GO' Command. Port A EQU 40H Port B EQU 41H ADDRESS OPCODE LABLE MNEMONIC COMMENTS 8C00 3E 80 MVI A,80H ;Initialise 8255 ;for mode 0. 8C02 D3 43 OUT 43H ;Port A & Port ;B as output Ports 8C04 AF XRA A ;Start with a ;value 00H. 8C05 D3 40 LOOP1: OUT PORTA ;Out to DAC 1. 8C07 D3 41 OUT PORTB ;Out to DAC 2. 8C09 3C INR A ;Increment the ;DAC input. 8C0A FE FF CPI 0FFH ;Has the Peak value ;been reached. 8C0C C2 05 8C JNZ LOOP1 ;No, loop back. 8C0F D3 40 LOOP2: OUT PORTA ;Out to DAC 1 8C11 D3 41 OUT PORTB ;Out to DAC 2 8C13 3D DCR A ;Decrement the ;DAC input. 8C14 C2 0F 8C JNZ LOOP2 ;Minimum value not ;reached, loop back 8C17 C3 05 8C JMP LOOP1 ;Repeat for ever 4.2 DEMONSTRATION PROGRAM FOR ESA 85-2 TRAINER ; Assume the interface is connected over J2 of the trainer. ; The trainer can be in KEYBOARD MODE or SERIAL MODE. ADDRESS OPCODE LABEL MNEMONIC COMMENTS E 80 MVI A,80H ;Initialise 8255 ;for mode D3 43 OUT 43H ;Port A & Port B as ;output ports

5 AF XRA A ;Start with ;a value 00H 8005 D3 40 LOOP1: OUT PORTA ;Out to DAC D3 41 OUT PORTB ;Out to DAC C INR A ;Increment the ;DAC input 800A FE FF CPI 0FFH ;Has the peak value ;been reached? 800C C JNZ LOOP1 ;No, Loop back 800F D3 40 LOOP2: OUT PORT A ;Out to DAC D3 41 OUT PORT B ;Out to DAC D DCR A ;Decrement the ;DAC input 8014 C2 0F 80 JNZ LOOP2 ;Minimum value not ;reached, loop back 8017 C JMP LOOP1 ;Repeat for ever. 4.3 DEMONSTRATION PROGRAM FOR ESA-80 TRAINER CMD55 EQU A043H PORTA EQU A040H PORTB EQU A041H ; Assume the interface is connected over J2 of the trainer. ; The trainer can be in KEYBOARD MODE or SERIAL MODE. ADDRESS OPCODE LABEL MNEMONIC COMMENTS E 80 LD A,80 ;Control word for ;8255 Port A & ;Port B output 8002 D3 43 OUT CMD55 ;O/P to command port 8004 AF LOOP1 : XOR A ;Clear Accumulator 8005 D3 40 OUT PORTA ;O/P the value to ;port A 8007 D3 41 OUT PORTB ;O/P the value to ;port B 8009 CD CALL DELAY ;Delay Equivalent ;to the off time ;of the square wave 800C 3E FF LDA 0FFH ;On portion of ;the wave form 800E D3 40 OUT PORTA 8010 D3 41 OUT PORTB

6 CD CALL DELAY ;Delay equivalent ;to the on time of ;the waveform C JMP LOOP FF FF DELAY: LD DE,0FFFFH ;Delay routine B BACK1: DCX D ;Pulse width can ;be varied by ;changing the B LD A,E ;value in DE ;register pair B3 ORA E 8026 C JNZ BACK C9 RET 4.4 DEMONSTRATION PROGRAM FOR ESA-65 TRAINER ; Assume the interface is connected over P4 of the trainer. ; The trainer can be in KEYBOARD MODE or SERIAL MODE. CMD55 EQU A043H PORTA EQU A046H PORTB EQU A041H ADDRESS OPCODE LABLE MNEMONIC COMMENTS 1000 A9 80 LDA #$80 ;port A O/P D 43 A0 STA CMD55 ;Control port ;port B O/P 1005 A9 00 START: LDA #00H ;Output 00H D 40 A0 STA PORTA ;port A to DAC 1 100A 8D 41 A0 STA PORTB ;port B to DAC 2 100D JSR DELAY ;delay 1010 A9 FF LDA #0FFH ;output FFH D 40 A0 STA PORTA ;port A to DAC D 41 A0 STA PORTB ;port B to DAC JSR DELAY ;delay 101B 4C JMP START ;start repeat ;infinitely 1020 A9 FF DELAY: LDA #$FF ;Delay routine D STA 1030H 1025 CE JUMP: DEC 1030H 1028 D0 FB BNE JUMP 102A 60 RTS 4.5 DEMONSTRATION PROGRAM FOR ESA-31 TRAINER

7 7 ; Assume the interface is connected over J2 of the trainer. ; The trainer can be in KEYBOARD MODE or SERIAL MODE. ORG SEG DAC2 8000H EQU 0E8H EQU 0E801H ADDRESS OPCODE LABLE MNEMONIC COMMENTS A0 E8 MOV P2,#SEG MOV R0,# MOV A,#80H ;Initialise F2 ;for mode0. Port A ;& B as O/P Ports ;B as output Ports 8008 E4 CLR A ;Start with value 00H F8 MOV R0,A ;out to DAC 1 800A 90 E8 01 MOV DPTR,#DAC2 ;out to DAC 2 800D F2 LOOP1: 800E F0 800F 04 INC A ;Increment the FB JNZ LOOP1 ;DAC input FF MOV A,#0FFH ;Has the peak ;been reached? ;No. loop back 8014 F2 LOOP2: ;out to DAC F0 ;out to DAC DEC A ;Decrement the ;DAC input FB JNZ LOOP2 ;Minimum value ;not reached? ;loop back F2 SJMP LOOP1 ;Repeat for ever 4.6 DEMONSTRATION PROGRAM FOR ESA-68K TRAINER ; Assume the interface is connected over P3 of the trainer. ADDRESS OPCODE MNEMONICS COMMENTS B F9 00 LEA.L $80300,A B 7C 00 MOVE.B #80,6(A5) ;Initialize

8 ;8255 all ;Ports output. 4060C CLR.B D0 4060E 1A 80 LOOP: MOVE.B D0,(A5) ;Start with ;values of B MOVE.B D0,2(A5) ;Out to DAC ADDQ.B #01,D0 ;Out to DAC F6 BRA $LOOP ;repeat for ever 4.7 DEMONSTRATION PROGRAM FOR ESA 196 TRAINER ;Assume the interface is connected over J1 of the trainer. ;The trainer can be in KEYBOARD MODE or SERIAL MODE. REG1 EQU 52H PORT_A EQU 200H PORT_B EQU 202H PORT_C EQU 204H CMD_PORT EQU 206H ADDRESS OPCODE LABLE MNEMONIC COMMENTS 8000 B LDB REG1,#80H ;Initialise 8255 for 8003 C STB REG1,CMD_PORT ;Port A & B ;O/P Ports B LDB REG1,#00H ;Start with value 00H 800B C LOOP1: STB REG1,PORT_A ;Out to DAC F C STB REG1,PORT_B ;Out to DAC INCB REG1 ;Increment DAC I/P FF 52 CMPB REG1,#0FFH ;Peak value ;is reached? 801A D7 EF JNE LOOP1 ;No loop back. 801C C LOOP2: STB REG1,PORT_A ;Out to DAC C STB REG1,PORT_B ;Out to DAC DECB REG1 ;Decrement DAC I/P D7 F2 JNE LOOP2 ;Minimum value ;not reached. 802A 27 DF SJMP LOOP1 ;No loop back

9 9 ;Repeat forever. 4.8 DEMONSTRATION PROGRAM FOR ESA 86/88-2 TRAINER ; Assume the interface is connected over J4 of the trainer. ; The trainer can be in KEYBOARD MODE or SERIAL MODE. cs = 0 MODE EQU 80H PORTA EQU FFE0H PORTB EQU FFE2H CMD_PORT EQU FFE6H ADDRESS OPCODE LABLE MNEMONIC COMMENTS 2000 BA E6 FF DDAC: MOVW DX,#CMD_PORT 2003 B0 80 MOVB AL,#Mode 2005 EE OUTB DX ;Set up 8255 ;for Mode0, ;Ports A,B, ;C output 2006 B0 00 MOVB AL,#00H ;Start with ;value of BA E0 FF Loop: MOVW DX,#PortA 200B EE OUTB DX ;Out to DAC 1 200C BA E2 FF MOVW DX,#PortB 200F EE OUTB DX ;Out to DAC INCW AX 2011 EB F5 JMP Loop ;Repeat forever 4.9 DEMONSTRATION PROGRAM FOR ESA 68-2 TRAINER ; Assume the interface is connected over J1 of the trainer. ; The trainer can be in Keyboard or Serial mode. CNTLA EQU 0C801H CNTLB EQU 0C803H DIRA EQU 0C800H DIRB EQU 0C802H ADDRESS OPCODE LABLE MNEMONIC COMMENTS 0400 ORG 400H

10 F CLRA ; INITIALISE B7 C8 01 STA CNTLA ; PORT A & PORT B AS O/P 0404 B7 C8 03 STA CNTLB ; PORTS COMA 0408 B7 C8 00 STA DIRA 040B B7 C8 02 STA DIRB 040E B7 C8 01 STA CNTLA 0411 B7 C8 03 STA CNTLB F CLRA ; START WITH VALUE B7 C8 00 LOOP1: STA DIRA ; OUT TO DAC B7 C8 02 STA DIRB ; OUT TO DAC 2 041B 4C INCA ; INCREMENT THE DAC INPUT 041C 81 FF CMPA #$0FF ; PEAK VALUE HAS REACHED? 041E 26 F5 BNE LOOP1 ; NO. LOOP BACK B7 C8 00 LOOP2: STA DIRA ; OUT TO DAC B7 C8 02 STA DIRB ; OUT TO DAC A DECA ; DECREMENT THE DAC INPUT CMPA #$00 ; MINIMUM VALUE REACHED? F5 BNE LOOP2 ; NO. LOOP BACK. 042B 20 E8 BRA LOOP1 ; REPEAT FOREVER END 4.10 DEMONSTRATION PROGRAM FOR ESA-51 TRAINER ;Assume the interface is connected over J10 of the trainer. ;The trainer can be in KEYBOARD MODE or in SERIAL MODE. SEG EQU 0E8H DAC2 EQU 0E801H ADDRESS OPCODE LABLE MNEMONIC COMMENTS ORG 8000H A0 E8 MOV P2,#SEG MOV R0,# MOV A,#80H ;Initialise F2 ;for mode E4 CLR A ;Start with F8 MOV R0,A ;out to DAC 1 800A 90 E8 01 MOV DPTR,#DAC2 ;out to DAC 2 800D F2 LOOP1: 800E F0 800F 04 INC A ;Increment the FB JNZ LOOP1 ;DAC input FF MOV A,#0FFH ;Has the peak

11 11 ;reached? 8014 F2 LOOP2: ;out to DAC F0 ;out to DAC DEC A ;Decrement the ;DAC input FB JNZ LOOP2 ;Minimum value ;reached? F2 SJMP LOOP1 ;Repeat for ever 4.11 DEMONSTRATION PROGRAM FOR ESA 86/88-3 TRAINER ; Assume the interface is connected over J10 of the trainer. ; This program generates a Square wave or a Triangular wave at ; points XOUT/YOUT of interface. The waveforms may be observed ; on an oscilloscope ; The program can be executed in STAND-ALONE MODE or SERIAL ; MODE of operation. ; The program starts at memory location 0:2000H ; Please refer ESA 86/88-3 user's manual for mnemonic syntax ; suitable to trainer Code Segment :0000H ADDRESS OPCODE LABEL MNEMONIC COMMENTS 2000 B MOVW AX,0000H ;Initialise ;Segment E C8 MOVW CS,AX ;Registers E C0 MOVW ES,AX 2007 BA E6 FF MOVW DX,0FFE6H ;Initialise 200A B0 80 MOVB AL,80H ;all 8255 ;ports as o/p 200C EE OUTB DX,AL 200D 9A FB CALLS 0FB00:0031H ;Newline routine 2012 EB 3A JMP START ;Display message ;string C MES: DB ' ' 201A E A 0D D 20 DB 0AH, 0DH, 'S-SQUARE WAVE' 202D A 0D D 20 DB 0AH, 0DH, 'T-TRIANGULAR

12 12 WAVE', 0H 203E C A D 2E CS 204E 8D START: LEA ;Display ;message on LCD B C2 MOVW AX,DX ;or Console A FB CALLS 0FB00:0013H ;Wait for A A FB GET: CALLS 0FB00:00A9H ;user entry 205E 3C 53 CMPB AL,53H ;If S, jump to JE SQUARE ;square wave ;generation ;routine C 54 CMPB AL,54H ;If T, jump to ;triangular JE TRI ;wave ;generation ;routine 2066 EB F1 JMP GET ;Wait for valid ;key only ; Triangular wave generation routine A FB TRI : CALLS 0FB00:0031H 206D B9 FF 00 RPT1: MOVW CX,0FFH ;Set up Count 2070 B0 00 MOVB AL,00H ;Start from FE C0 UP: INCB AL ;Increment ;data for +ve 2074 BA E0 FF MOVW DX,0FFE0H ;going slope ;and output 2077 EE OUTB DX,AL ;at Port A and ;Port B 2078 BA E2 FF MOVW DX,0FFE2H 207B EE OUTB DX,AL 207C E2 F4 LOOP UP 207E B9 FF 00 MOVW CX,0FFH ;Set up Count B C1 MOVW AX,CX ;Start from FFh 2083 FE C8 DOWN: DECB AL ;Decrement data ;for -ve 2085 BA E0 FF MOVB DX,0FFE0H ;going slope ;and output 2088 EE OUTB DX,AL ;at Port A ;and Port B 2089 BA E0 FF MOVW DX,0FFE0H 208C EE OUTB DX,AL

13 13 208D BA E2 FF MOVW DX,0FFE2H 2090 EE OUTB DX,AL 2091 E2 F0 LOOP DOWN 2093 E8 D8 JMP RPT1 ;Repeat ;continuously ; Square wave generation routine A FB SQUARE: CALLS 0FB00:0031H 209A B0 FF RPT2: MOVB AL,0FFH ;Output FFh at ;ports 209C BA E0 FF MOVW DX,0FFE0H 209F EE OUTB DX,AL 20A0 BA E2 FF MOVW DX,0FFE2H 20A3 EE OUTB DX,AL 20A4 B MOVW CX,1700H ;Delay 20A7 E2 FE DLY1: LOOP DLY1 20A9 B0 00 MOVB AL,00H ;Output 0 at ;ports 20AB BA E0 FF MOVW DX,0FFE0H 20AE EE OUTB DX,AL 20AF BA E2 FF MOVW DX,0FFE2H 20B2 EE OUTB DX,AL 20B3 B MOVW CX,1700H ; Delay 20B6 E2 FE DLY2: LOOP DLY2 20B8 EB 70 JMP RPT2 ; Repeat ;continuously 4.12 DEMONSTRATION PROGRAM FOR ESA-51E TRAINER ;Assume the interface is connected over J5 of the trainer. ;The trainer can be in KEYBOARD MODE or in SERIAL MODE. SEG EQU 0E8H DAC2 EQU 0E801H ADDRESS OPCODE LABLE MNEMONIC COMMENTS ORG 8000H A0 E8 MOV P2,#SEG MOV R0,# MOV A,#80H ;Initialise 8007 F2 ;8255 for ;mode E4 CLR A ;Start with 0

14 F8 MOV R0,A ;out to DAC 1 800A 90 E8 01 MOV DPTR,#DAC2 ;out to DAC 2 800D F2 LOOP1: 800E F0 800F 04 INC A ;Increment the FB JNZ LOOP1 ;DAC input FF MOV A,#0FFH ;Has the peak ;value reached? 8014 F2 LOOP2: ;out to DAC F0 ;out to DAC DEC A ;Decrement the FB JNZ LOOP2 ;DAC I/P value ;minimum value ;reached? F2 SJMP LOOP1 ;Repeat for ever 4.13 DEMONSTRATION PROGRAM FOR ESA 86/88E TRAINER ; Assume the interface is connected over J4 of the trainer. ; This program generates a Square wave or a Triangular wave at ; points XOUT/YOUT of interface. The waveforms may be observed ; on an oscilloscope ; The program can be executed in STAND-ALONE MODE or SERIAL ; MODE of operation. ; The program starts at memory location 0:2000H ; Please refer ESA 86/88E user's manual for mnemonic syntax ; suitable to trainer Code Segment :0000H ADDRESS OPCODE LABEL MNEMONIC COMMENTS 2000 B MOVW AX,0000H ;Initialise ;Segment E C8 MOVW CS,AX ;Registers E C0 MOVW ES,AX 2007 BA E6 FF MOVW DX,0FFE6H ;Initialise 200A B0 80 MOVB AL,80H ;all 8255 ;ports as o/p 200C EE OUTB DX,AL 200D 9A FB CALLS 0FB00:0031H ;Newline ;routine 2012 EB 3A JMP START ;Display ;message

15 15 ;string C MES: DB ' ' 201A E A 0D D 20 DB 0AH, 0DH, 'S-SQUARE WAVE' 202D A 0D D 20 DB 0AH, 0DH, 'T-TRIANGULAR WAVE', 0H 203E C A D 2E CS 204E 8D START: LEA ;Display ;message on LCD B C2 MOVW AX,DX ;or Console A FB CALLS 0FB00:0013H A A FB GET: CALLS 0FB00:00A9H ;Wait for user ;entry 205E 3C 53 CMPB AL,53H ;If S, jump to JE SQUARE ;square wave ;generation ;routine C 54 CMPB AL,54H ;If T, jump to ;triangular JE TRI ;wave ;generation ;routine 2066 EB F1 JMP GET ;Wait for valid ;key only ; Triangular wave generation routine A FB TRI : CALLS 0FB00:0031H 206D B9 FF 00 RPT1: MOVW CX,0FFH ;Set up Count 2070 B0 00 MOVB AL,00H ;Start from FE C0 UP: INCB AL ;Increment ;data for +ve 2074 BA E0 FF MOVW DX,0FFE0H ;going slope ;and output 2077 EE OUTB DX,AL ;at Port A and ;Port B 2078 BA E2 FF MOVW DX,0FFE2H 207B EE OUTB DX,AL

16 16 207C E2 F4 LOOP UP 207E B9 FF 00 MOVW CX,0FFH ;Set up Count B C1 MOVW AX,CX ;Start from FFh 2083 FE C8 DOWN: DECB AL ;Decrement data ;for -ve 2085 BA E0 FF MOVB DX,0FFE0H ;going slope ;and output 2088 EE OUTB DX,AL ;at Port A ;and Port B 2089 BA E0 FF MOVW DX,0FFE0H 208C EE OUTB DX,AL 208D BA E2 FF MOVW DX,0FFE2H 2090 EE OUTB DX,AL 2091 E2 F0 LOOP DOWN 2093 E8 D8 JMP RPT1 ;Repeat ;continuously ; Square wave generation routine A FB SQUARE: CALLS 0FB00:0031H 209A B0 FF RPT2: MOVB AL,0FFH ;Output FFh at ;ports 209C BA E0 FF MOVW DX,0FFE0H 209F EE OUTB DX,AL 20A0 BA E2 FF MOVW DX,0FFE2H 20A3 EE OUTB DX,AL 20A4 B MOVW CX,1700H ;Delay 20A7 E2 FE DLY1: LOOP DLY1 20A9 B0 00 MOVB AL,00H ;Output 0 at ;ports 20AB BA E0 FF MOVW DX,0FFE0H 20AE EE OUTB DX,AL 20AF BA E2 FF MOVW DX,0FFE2H 20B2 EE OUTB DX,AL 20B3 B MOVW CX,1700H ;Delay 20B6 E2 FE DLY2: LOOP DLY2 20B8 EB 70 JMP RPT2 ;Repeat ;continuously 5.0 EXERCISES

17 17 The sample program presented in this manual demonstrated some specific applications of this interface. A few exercises are presented below to enable the user gain a better understanding of the interface. Users are encouraged to visualize other applications and develop software accordingly. Some of the suggested exercises are: 1) Character generation: For eg: Generating the character A 2) Generation of Sine wave. 3) Generation of circle. 4) Generation of following waveform:

CONTENTS. 1.0 Introduction Description of the Circuit Installation Connection of Power Supply 4

CONTENTS. 1.0 Introduction Description of the Circuit Installation Connection of Power Supply 4 1 CONTENTS PAGE NO 1.0 Introduction 2 2.0 Description of the Circuit 3 3.0 Installation 3 3.1 Connection of Power Supply 4 3.2 Connection of Output Signals to Relay Contacts 4 3.3 Interfacing to ESA Trainers