dm_SendRecv (send & receive a block of bytes as is between Master and Device)

Function

int16 dm_SendRecv(uint16 uiPortNo, uchar08 *ucpSendBuf, uchar08 ucBytesCount, uchar08 *ucpRecvBuf, uint16 uiBufSize, char08 *cpErrMsg);

Description

Send & receive or take acknowledge for a block of bytes between Master and Device.

Input Parameters

• uchar08 uiPortNo – (virtual) comport number in order to communicate with Master
• char08 *ucpSendBuf – pointer to a data buffer to send
• uchar08 ucBytesCount – bytes number to send from ucpSendBuf
• uint16 uiBufSize – size of receive data buffer ucpRecvBuf

Output parameters

• char08 *ucpRecvBuf – pointer to a data buffer to return received data
  
• char08 *cpErrMsg – pointer to buffer to return error message (minimum 256 bytes)

Return value

Number of received bytes if success or negative error number.

Example

char08 cpErrMsg[256];

uchar08 ucpBuf[] = { 0x12, 0x34 }, ucAck;

int16 iRes = dm_SendRecv(iPortNo, ucpBuf, 2, &ucAck, 1, cpErrMsg);