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INTRODUCTION

This interface board has sixteen digital input/output channels which can be used as either input

or output as desired. In addition, there are eight analogue outputs with 6 bit resolution, one

analogue output with 8 bit resolution, and four analogue inputs of 8 bit resolution. If more digital

outputs are required, then the analogue outputs can be used by setting to minimum or

maximum output voltage. If there are too few inputs, then the analogue inputs may be used. In

this way it is very simple to track the state of a rotating switch by connecting in a different

voltage for every state. Please note that these extra input and output channels are not optically

isolated.

The number of inputs/outputs can be further expanded by connecting more cards together, up

to a maximum of four. Each card is given its own identification by means of a two pole DIP-

switch SW1 (see table below for channel numbering).

To connect the card to the computer the printer port is used (note that there is no need to install

an extra printer port as the printer can be connected to the interface card). Three lines from this

port are used, namely, "Select" (pin 13), "Autofeed" (pin 14) and "Select in" (pin 17).

Communication between the computer and interface card is by means of a serial link. One line

(Select in) serves as the clock signal, the second (Autofeed) as the data output, and the third

(Select) as the data input.

All communication routines are contained in a Dynamic Link Library (DLL) K8D.DLL. This

document describes all the DLL functions and procedures that are available for your application

programme. Using the DLL allows you to write custom Windows 9x, NT or XP based

applications in Visual C++, Delphi, Visual Basic, or any other 32-bit Windows application

development tool that supports calls to a DLL. Thus, there is no need to be concerned about the

communication protocol.

A complete overview of all procedures, functions and variables that are used by the "K8D.DLL"

follows. The example program can also be carefully studied in order to gain an insight as to how

to construct your customised application programmes.

Note that all examples are written for Delphi.

At the end of this document there are full declarations for the DLL function and procedures for

Delphi and Visual Basic.

Summary of content (29 pages)

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INTRODUCTION This interface board has sixteen digital input/output channels which can be used as either input or output as desired. In addition, there are eight analogue outputs with 6 bit resolution, one analogue output with 8 bit resolution, and four analogue inputs of 8 bit resolution. If more digital outputs are required, then the analogue outputs can be used by setting to minimum or maximum output voltage. If there are too few inputs, then the analogue inputs may be used.
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TABLE 'SW1' SETTINGS CARD NUMBER CHIP NUMBER CHANNEL NUMBERS 0 (OFF-OFF) IO-chip no: 0 IO-chip no: 1 DAC-chip no: 0 AD-chip no: 0 IO-channels: 1...8 IO-channels: 9...16 DAC-channels: 1...8 AD-channels: 1...4 DA-channel: 1 1 (OFF-ON) IO-chip no: 2 IO-chip no: 3 DAC-chip no: 1 AD-chip no: 1 IO-channels: 17...24 IO-channels: 25...32 DAC-channels: 9...16 AD-channels: 5...8 DA-channel: 2 2 (0N-OFF) IO-chip no: 4 IO-chip no: 5 DAC-chip no: 2 AD-chip no: 2 IO-channels: 33...40 IO-channels: 41...
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OVERVIEW OF THE 'K8D.DLL' VARIABLES The application program has access to the the following variables via the k8d.dll: VARIABLE TYPE INITIAL VALUE DA Array[1..4] of Integer 0 DAC Array[1..32] of Integer 0 IOconfig Array[0..7] of Integer $0FF IOdata Array[0..
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OVERVIEW OF 'K8D.
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IOoutput(Chipno,Data) UpdateIOchip(Chipno) UpdateAllIO ClearIOchannel(Channelno) ClearIOchip(Chipno) ClearAllIO SetIOchannel(Channelno) SetIOchip(Chipno) SetAllIO Input procedures and functions ReadIOchannel(Channelno) ReadIOchip(Chipno) ReadIOconficArray(Buffer) ReadIOdataArray(Buffer) ReadDACarray(Buffer) ReadDAarray(Buffer) General procedures SelectI2CprinterPort(Printer_no) Start_K8000 Stop_K8000 Sets the outputs of the IO-chip according to the data (inputs do not change) Sets the outputs of the IO-ch
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'K8D.DLL' PROCEDURES AND FUNCTIONS Start_K8000 Syntax PROCEDURE Start_K8000; Description Initializes the communication routines for the K8000 card. Loads the drivers needed to communicate via the LPT port. This procedure must be performed in the beginning of the application program. Example BEGIN Start_K8000; END; Sop_K8000 Syntax PROCEDURE Stop_K8000; Description Unloads the communication routines for K8000 card and unloads the drivers needed to communicate via the PLT port.
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END; ReadADchannel AD Syntax FUNCTION ReadADchannel(Channel_no: Longint):Longint; Parameter Channel_no: Value between 1 and 16 which corresponds to the AD channel whose status is to be read. Result AD: The corresponding 'AD' data is read according to the status of the AD input. Description The input voltage of the selected 8-bit Analogue to Digital converter channel is converted to a value which lies between 0 and 255 and registered in the respective 'AD' data variable.
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Example BEGIN OutputDAchannel(1,127); // DA channel 1 is at 1/2 Vmax END; ClearDAchannel DA Syntax PROCEDURE ClearDAchannel(Channel_no: Longint); Parameter Channel_no: Value between 1 and 4 which corresponds to the 8-bit DA channel number in which the data is to be erased. Result DA: The 'DA' data variable of the selected DA-channel is set to minimum (0) . The selected DA-channel is set to minimum output voltage (0 Volt).
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SetDAchannel DA Syntax PROCEDURE SetDAchannel(Channel_no: TDAchannel); Parameter Channel_no: Value between 1 and 4 which corresponds to the 8-bit DA channel number in which the data is to be set to maximum. Result The selected DA-channel is set to maximum output voltage. Description The selected 8-bit Digital to Analogue Converter channel is set to maximum output voltage.
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The selected DAC-channel is updated. Description The indicated 6-bit Digital to Analogue Converter channel is modified with the new data. This means that the data corresponds to a specific voltage. The value 0 corresponds to a minimum output voltage (Vmin) and the value 63 corresponds to a maximum output voltage (Vmax) which can be set using the preset on the interface board.
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The eight DAC-channels of the selected 6-bit Digital to Analogue Converter chip are set to minimum (Vmin). Example BEGIN ClearDACchip(0); // DAC channels 1...8 are at Vmin END; ClearAllDAC DAC Syntax PROCEDURE ClearAllDAC; Result All DAC-channels are set to minimum output voltage. Description All DAC-channels of the 6-bit Digital to Analogue Converters are set to minimum output voltage (Vmin) . Example BEGIN ClearAllDAC; // All DAC channels 1...
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SetDACchip DAC Syntax PROCEDURE SetDACchip(Chip_no: Longint); Parameter Chip_no: Value between 0 and 3 which corresponds to the address of the 6-bit DAC chip in which the 8 channels are to be set to maximum output voltage. Result The 8 DAC-channels of the indicated DAC-chip are set to maximum output voltage. Description The eight DAC-channels of the selected 6-bit Digital to Analogue Converter chip are set to the maximum output voltage (Vmax).
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All digital Input/Output channels (1...64) are configured as inputs. Each IO chip (0...7) contains a variable in which the configuration of each IO pin is returned in the form of a data bit which is not necessarily high. If this bit is high (1) it means that this is an input. Writing to this IO-channel will have no effect. The status of the IO-channels can only be determined by an external signal.
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variable of the respective IO chip. The status of the IO-channel can only be determined by an external signal that is fed to it. Example BEGIN ConfigIOchannelAsInput(1); // IO channel 1 is now configured as input'); END; ConfigAllIOasOutput IO Syntax PROCEDURE ConfigAllIOasOutput; Result IOconfig: The 'IOconfig' variables for all Input/Output ports are set low (0). Description All digital Input/Output channels (1...64) are configured as outputs. Each IO chip (0...
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ConfigIOchannelAsOutput IO Syntax PROCEDURE ConfigIOchannelAsOutput(Channel_no: Longint); Parameter Channel_no: Value between 1 and 64 which corresponds to the Input/Output channel that is to be configured as an output . Result IOconfig:Via the channel number, the IO-chip number and bit number are determined in order to set the 'IOconfig' variable low (0). Description The selected Input/Output channel is configured as an output while the configuration of the other channels remain unchanged.
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ConfigIOchipAsOutput(0); UpdateIOdataArray(0,204); // 204 is in binary format 11001100 // this sets channels 3,4,7,8 and clears channels 1,2,5,6 END; ClearIOchArray IO Syntax PROCEDURE ClearIOchArray(Channel_no: Longint); Parameter Channel_no: Value between 1 and 64 which corresponds to the Input/Output channel that is to be cleared. Result IOdata: If selected channel is an output then the correct bit in the 'IOdata' variable of the corresponding chip is set low (0).
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Result IOdata: The bits of the 'IOdata' variable of the selected chip are set low (0) but the bits that correspond to inputs remain unchanged. Description The status of the Input/Output ports are held in the 'IOdata' variable. Each bit of this variable corresponds to the status of an IO-channel. If the outputs of the IO-chip are to be cleared then it is not recommended to immediately set the 'IOdata' variable to 0, because the status of the input channels would no longer correspond to the physical status.
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END; SetIOdataArray IO Syntax PROCEDURE SetIOdataArray(Chip_no: Longint); Parameter Chip_no: Value between 0 and 7 that corresponds to the address setting of the Input/Output chip in which the outputs are to be set. Result IOdata: The bits of the 'IOdata' variable of the selected chip are set high (1) but the bits that correspond to inputs remain unchanged. Description The status of the Input/Output ports are held in the 'IOdata' variable.
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Description The channels of the selected IO-chip which have been configured as outputs are updated with the status of the corresponding bits in the data parameter. A high (1) level means that the output is set, and a low (0) level means that the output is cleared. The status of the inputs remains unchanged. The 'IOdata' and 'IO' variables of the respective IO-chip are likewise updated. Example BEGIN ConfigIOchipAsOutput(1); IOoutput(1,128); // Output channels 9..
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All channels of the IO-chips which have been configured as outputs are changed according to the status of the corresponding bits in the 'IOdata' array. A high (1) level means that the output is set, a low (0) level means that the output is cleared. The status of the inputs remain unchanged. Example BEGIN ConfigAllIOasOutput; UpdateIOdataArray(0,1); // channel 1 on UpdateIOdataArray(1,128); // channel 16 on UpdateAllIO; // Output channel 1 & 16 are on, Output channels 2..
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All channels of the selected Input/Output chip which have been configured as outputs are cleared. The status of the inputs remain unchanged. The 'IOdata' and 'IO' variables are changed according to the new status. Example BEGIN ConfigIOchipAsOutput(1); ClearIOChip(1); // Output channels 9...16 are off END; ClearAllIO IO Syntax PROCEDURE ClearAllIO; Result IOdata:The bits in the 'IOdata' variables that correspond to outputs are set low (0), those of the inputs remain unchanged. All outputs are cleared.
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BEGIN ConfigIOchannelAsOutput(9); SetIOchannel(9); // Output channel 9 is on END; SetIOchip IO Syntax PROCEDURE SetIOchip(Chip_no: Longint); Parameter Chip_no: Value between 0 and 7 which corresponds to the address setting of the Input/Output chip in which the outputs are to be set. Result IOdata: The bits in the 'IOdata' variable of the selected IO-chip that correspond to outputs are set high (1), those of the inputs remain unchanged.
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END; ReadIOchannel IO Syntax FUNCTION ReadIOchannel(Channel_no: Longint): Boolean; Parameter Channel_no: Value between 1 and 64 which corresponds to the Input/Output channel whose status is to be read. Result IOdata: The bit in the 'IOdata' variable of the selected channel is changed according to the status of that channel. A high (1) means that the channel has been set, a low (0) means that it has been cleared.
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ReadIOconfigArray IO Syntax PROCEDURE ReadIOconfigArray(Buffer:Pointer); Parameter Buffer: A pointer to the array of long integers where the IO configuration data will be read. Description The IO configuration data array is read from the K8D.DLL to the application program. Example var // global variables IOconfig: ARRAY[0..MaxIOchip] OF Integer; procedure TForm1.
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Syntax PROCEDURE ReadDACarray(Buffer:Pointer); Parameter Buffer: A pointer to the data array of long integers where the DAC data will be read. Description The DAC data array is read from the K8D.DLL to the application program. Example var // global variables DAC: ARRAY[1..MaxDACchannel] OF Integer; procedure TForm1.Button1Click(Sender: TObject); var p:pointer; i:integer; s:string; begin p:=@DAC; // Address of the data buffer for the DAC array ReadDACarray(p); // Read the data from K8D.DLL memo1.
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Using the DLL in Delphi Here is the declaration of some array variables, K8D.DLL procedures and functions and the two most important procedures of the application program (FormCreate and FormClose). var IOconfig: ARRAY[0..MaxIOchip] OF Integer; IOdata: ARRAY[0..MaxIOchip] OF Integer; DAC: ARRAY[1..MaxDACchannel] OF Integer; DA: ARRAY[1..MaxDAchannel] OF Integer; implementation {$R *.DFM} {IO CONFIGURATION PROCEDURES} PROCEDURE ConfigAllIOasInput; stdcall; external 'K8D.
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end; procedure TForm1.
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Using the DLL in Visual basic Here is the declaration of the K8D.DLL procedures and functions, some array variables, and the two most important procedures of the application program (Form_Load and Form_Terminate). Option Explicit 'Declare use of the DLL 'K8D.DLL interfaces 'IO CONFIGURATION PROCEDURES Private Declare Sub ConfigAllIOasInput Lib "k8d.dll" () Private Declare Sub ConfigAllIOasOutput Lib "k8d.dll" () Private Declare Sub ConfigIOchipAsInput Lib "k8d.
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Dim IOdata(0 To MaxIOchip) As Long Dim DAC(1 To MaxDACchannel) As Long Dim DA(1 To MaxDAchannel) As Long Private Sub Form_Load() Start_K8000 End Sub Private Sub Form_Terminate() Stop_K8000 End Sub