Re: the hex instruction convert

[Dirk Zimoch <dirk.zimoch@psi.ch>]

out “\x01\x01\x00\x01%.4r%<sum>”;
or
out $1 0x01 $2 $3 “%.4r%<sum>”;

%4r would sign extend 1 byte data to 4 bytes output.
%.4r prints 4 byte data.
The documentation is wrong here. I will fix that.

Dirk

peter.owens@stfc.ac.uk wrote:
> I think the stream device protocol converters %r and %<sum> will do what 
> you want :
>
>  
>
> out “\x01\x01\x00\x01%4r%<sum>”;
>
>  
>
> But you would probably want to pass the address information as variables :
>
>  
>
> out $1 0x01 $2 $3 “%4r%<sum>”;
>
>  
>
> *From:* tech-talk-bounces@aps.anl.gov 
> [mailto:tech-talk-bounces@aps.anl.gov] *On Behalf Of *Damek Yahto
> *Sent:* 16 November 2010 03:06
> *To:* tech-talk@aps.anl.gov
> *Subject:* the hex instruction convert
>
>  
>
> HI Tech-talk,I am trying to build an IOC to communicate with serial 
> devices through the serial to Ethernet Device Server.
>
> The serial device supports the streams of hex format.
>
> The binary command format when using RS232 or RS485 is as follows:
> Bytes    Meaning
> 1        Module address
> 1        Command number
> 1        Type number
> 1        Motor or Bank number
> 4        Value (MSB first!)
> 1        Checksum
> total: 9 bytes
>
> the checksum is calculated by adding up all bytes (including the module 
> address byte) using
> 8-bit addition. Here is the examples to show how to do this:
>     in C:
>     unsigned char i, Checksum;
>     unsigned char Command[9];
>
>     //Set the “Command” array to the desired command
>     Checksum = Command[0];
>     for(i=1; i<8; i++)
>         Checksum+=Command[i];
>     Command[8]=Checksum; //insert checksum as last byte of the command
>      //Now, send it to the module
>
> I want to control the motor to rotate right  through the serial device.
>
> Instruction:
> Rotate right,   motor #1, velocity = 350
> Binary:
> Byte Index         0                1              2            
> 3                  4               5                6               
>  7               8
> Function          Target-     Instruction   Type      Motor/         
> Operand     Operand      Operand     Operand      Checksum
>                       address    Number                     
> Bank           Byte3        Byte2         Byte1          Byte0
> Value (hex)        0x01       0x01          0x00       0x01            
> 0x00         0x00            0x01           0x5e            0x62
>
> By writing streamDevice protocol 
> file(out'\x01\x01\x00\x01\x00\x00\x01\x5e\x62';),motor will rotate. 
> Using "EDM" or "caput" to
>
> input the variable,where do I do my processing (like calculating the 
> Checksum and convert the velocity to four bytes long)? where
>
> write my own parsing code in C?having other approaches. Could you give 
> any example?
>
> Thanks,
>
> Yahto Dam
> 2010.11.16
>
>
> --
> Scanned by iCritical.