I have a Coin Counter Machine(SC350/360) which connects to a computer via RS232C Interface. I've the technical documentation which describes the communication protocols and a working pascal program is also included for manipulating the machine. I copied the pascal code and tested it on Turbo Pascal, using DosBox, for windows 7 64 bit and the code compiles successfully. What I wanted to achieve now was to convert those pascal codes to C#.Net but I was having a hard time when converting few lines to C# as I don't have much experience on serial port programming.
This was the code in Pascal to Initialize communication with the machine. (Set baudrate to 9600, 8 bits, no parity, 1 stop bit)
uses crt;
const
{ COM1: RS232 port address }
RXTX = $3F8; { $2F8 if COM2: is used }
ACK = 6;
NAK = 21;
ESC = 27;
var
dummy,
checkSum : integer;
key : char;
protocol : integer;
var i : integer;
begin
i := 1843200 div 9600 div 16;
port[RXTX + 3] := $80;
port[RXTX + 1] := hi(i);
port[RXTX]:= lo(i);
port[RXTX + 3] := 3;
port[RXTX + 4] := $A;
while odd(port[RXTX + 5]) do
begin
dummy := port[RXTX];
delay(10);
end;
end; { InitComm }
The corresponding C# for the above code I came up was; (Please correct me if I get it wrong)
SerialPort port=new SerialPort("COM1",9600,Parity.None,8,StopBits.One);
But I couldn't understand how to convert the rest of the pascal procedures. Some of these procedures i had difficulty with are;
procedure Tx(data : integer);
{ Transmit a character on serial channel }
begin
while port[RXTX + 5] and $20 = 0 do;
port[RXTX] := data and $FF;
end; { Tx }
function RxWait : integer;
{ Waits for a character from serial channel }
begin
while not odd(port[RXTX + 5]) do;
RxWait := port[RXTX];
end; { RxWait }
procedure Tx2(data : integer);
{ Transmit a char on serial channel + Calculate check sum }
begin
Tx(data);
checkSum := (checkSum + data) and $FF;
end; { Tx2 }
Could you guys please help me how to convert those pascal codes to the equivalent C#? I know I can write to a port using the 'port.Write' Method but that couldn't exactly fit the turbo pascal code with the port array.(e.g port[RXTX + 3] := $80;) I don't know what the port array index 'RXTX+3' is referring relating to C#.
I would really appreciate it if you could give me a hand on this and I hope I'll learn to convert the rest of the pascal codes myself. :)
I have written the following equivalent C# code for the pascal program using the help I got from the good people here. Please correct me if i have made a mistake in my code.
public void Tx(int data)
{
if (!port.IsOpen)
port.Open();
port.Write(new byte[] { (byte)(data & 0xFF) }, 0, 1);
port.Close();
}
/// <summary>
/// Wait for a character from serial channel
/// </summary>
/// <returns></returns>
public int RxWait()
{
if (!port.IsOpen)
port.Open();
int readByte = port.ReadByte();
port.Close();
return readByte;
}
/// <summary>
/// Transmit a char on serial channel + Calculate check sum
/// </summary>
/// <param name="data"></param>
public void Tx2(int data)
{
Tx(data);
checkSum = (checkSum + data) & 0xFF;
}
By the way here is the protocol described in the device documentation.
Computer SC 350/360
–––––––> ESC (message start)
–––––––> Command
<––––––> Data (direction depends on command)
<––––––> Check sum (direction depends on command)
<––––––– Receipt:
- ACK (if check sum is correct) or
- NAK (if check sum is incorrect)
And moreover i've here provided the rest of the code with an example of a command send to count the number of coins.
/// <summary>
/// Transmit command (no data) on serial channel
/// </summary>
/// <param name="c1"></param>
/// <param name="c2"></param>
/// <param name="sendCheckSum"></param>
public void TxCommand(char c1, char c2, bool sendCheckSum)
{
Tx(ESC);
checkSum = 0;
Tx2((int)c1);
Tx2((int)c2);
if (sendCheckSum)
{
Tx2(checkSum);
dummy = RxWait();
}
}
/// <summary>
/// Read n bytes from serial channel
/// </summary>
/// <param name="n"></param>
/// <returns></returns>
public double ReadNumber(int n)
{
double number;
int i;
number = checkSum = 0;
for (i = 0; i < n; i++)
number = number * 256 + RxWait();
dummy = RxWait();
return number;
}
/// <summary>
/// Read the number of Coins counted
/// </summary>
/// <returns>Number of Coins</returns>
public double ReadCountReg()
{
TxCommand('R', 'C', false);
double coinsCounted = ReadNumber(4);
dummy = RxWait();
return coinsCounted;
}
To send a command to count coins;
double coinsCounted = ReadCountReg();
Console.WriteLine(Math.Round(coinsCounted, 0) + " coins counted");
The protocol for reading count register is;
Computer SC 350/360
–––––––> ESC
–––––––> “R”
–––––––> “C”
<––––––– CountRegister (CR)
<––––––– (CR ^ FF00,000016 + CR ^ FF,000016 + CR ^ FF0016 +
CR ^ FF16) ^ FF16
<––––––– ACK
