Pacsci 930 Comm32 .dll help

[jw666]

Has anyone used 930 Comm32 .dll from Pacific Scientific? The OC930 is an option card that allows serial interface with a pc or plc to a servo motor driver. Pacsci's website has a hardware and software reference manual that gives parameters to set tuning, position, loop gearing, velocity, etc. I have software that allows for the automated setup of a particular motors and drivers interface. I am interested in using Labiew to control speed, direction, acceleration, deceleration, speed feedback, enable, etc. This is done thru a serial port. I am not sure even how to approach initalization of the serial communcation with the dll. The OC930 card appears to only use 9600 baud communication. I am using Labview 7.1 and have the call library function node with several function names including InitComPort930, CommDllCompileTime930, CommDllVersion930, ExeCmd930, GetVar930, PutVar930, SetAxis930. Where do I start?

[jw666]

All,

Just an update, I have been able to use functions InitComPort930, CommDLLVersion930, SetAxis930 with Labview's Call Library function.

As for the othe functions, I'm stumped.

On Pacific Scientific's website I found interface notes for C, C++. below are the notes.

The C / C++ interface is as follows:

int InitComPort930(int argPortNum);

int ExeCmd930(const char *cmd);

int GetVar930(const char *name, double *value);

int PutVar930(const char *name, double value);

int SetAxis930(int a);

What are ExeCmd930, GetVar930 and PutVar930 functions looking for? integers of the vaiables and commanad or what?

Thanks in advance,

jw666

[Shaun Hayward]

Depending on how many (and how complex) the commands you want to use are, you may be able to use LabVIEW's built in RS232 functions (VISA Serial Read/Write) to send the commands directly to the motor without using the company's DLL. In the past, for simple applications, I have found this considerably easier than battling with not-so-well documented 3rd party DLLs.

Shaun

[Rolf Kalbermatter]

QUOTE (jw666 @ Nov 13 2008, 11:10 AM)

All,

Just an update, I have been able to use functions InitComPort930, CommDLLVersion930, SetAxis930 with Labview's Call Library function.

As for the othe functions, I'm stumped.

On Pacific Scientific's website I found interface notes for C, C++. below are the notes.

The C / C++ interface is as follows:

int InitComPort930(int argPortNum);

int ExeCmd930(const char *cmd);

int GetVar930(const char *name, double *value);

int PutVar930(const char *name, double value);

int SetAxis930(int a);

What are ExeCmd930, GetVar930 and PutVar930 functions looking for? integers of the vaiables and commanad or what?

Thanks in advance,

const char *name is a C string pointer. So configure the according parameter in the CLN as a String of type C Pointer.

double is the C equivalent for a LabVIEW double precision floating point number. So this will need to be a Numeric parameter of type 8-Byte double. The * indicates it is passed by reference so set it to Pass: Pointer to Value. The other has no * so it is Pass: Value.

What the actual string should contain is of course entirely to the device or the DLL or maybe even both.

Rolf Kalbermatter

[jw666]

QUOTE (rolfk @ Nov 17 2008, 03:17 PM)

const char *name is a C string pointer. So configure the according parameter in the CLN as a String of type C Pointer.

double is the C equivalent for a LabVIEW double precision floating point number. So this will need to be a Numeric parameter of type 8-Byte double. The * indicates it is passed by reference so set it to Pass: Pointer to Value. The other has no * so it is Pass: Value.

What the actual string should contain is of course entirely to the device or the DLL or maybe even both.

Rolf Kalbermatter

Thank you for your help. I am way above my level of expertise. I found a way to use simpler serial communication. Thanks again!

jw666