Modbus TCP如何使用

我猜我属于只为Modbus TCP实现了一个从端口的组。不过，我认为这很简单。使用伯克利套接字，你的奴隶实际上是服务器，而你的主人是客户端。如果你知道你的奴隶的IP地址-使用这个实现的静态地址使测试变得更容易——那么你只需遵循下面的逻辑：C:Microchip HyralV2O04AppTCPIPBelkelyTCPPlie固件 SRCApp.c来处理它的TCP客户端部分。从这里，您关心的是以下内容：打包消息发送、拆封收到的消息和处理任何错误。



      以下为原文

    I guess I fall into that group that has only implemented a slave port for modbus TCP. However, I would think that it's pretty straightforward. Using Berkeley sockets, your slaves are actually the servers while your master is a client. If you know the IP addresses of your slaves - use static addresses for this implementation to make testing easier - then you would simply follow the logic here: C:microchipharmonyv2_04appstcpipberkeley_tcp_clientfirmwaresrcapp.c. That handles the TCP client part of it. From there, all you're concerned with is the following: packaging the message to send, unpackaging the message received, and handling any errors.

谢谢你的回复。我正在使用FrimoDeBUS库，此时，我可以从我的客户端设备打开一个TCP套接字。我有问题包装框架发送。我正在尝试使用函数：EMBRRORCORE EMBTCPSENT（UCHAR未使用，const uCHAR**pUcFrand，UsStudio UnStand）{EnMRrOrgEntoStudio＝MbEnEnOrr；UCHAR * PUCBMTCPFrase=（UCHAR *）PUCSTRAMP -MPU-TCPPFUNC；USTCpPLONTHONS长度+MUBTCPUFUNC；PUCBMTCPFrime[MbTCPPLLEN ] =（US长度+1）和G（1）：（XMbTCPtPrError响应（PUCBMTCPFrror，USTCPLSLIN）＝FALSE）{ESTATAS= MBEIIO；}返回ESTATUS；}这意味着：BoOL XMbTCPtPosisEdTrror（const UCHAR *PUCBMTCPFrimeS，UsSuthUSTCPLS长度）{BoOL BFrAMESeNET= FALSE；//FReal-de TrAM-EnviaaBooBabordt＝false；Word Res；/QueSe PayeDeEnsibr Enel缓冲区int iBythEnter＝0；//字节EnviaDOS int iTimeOUT＝MbO-TCPpRead TimeUlt；//TimePo TimeOutdo{Res＝TCPIsPutReady（XististOnCKET）；IF（REST；（USTCpLime- iByTeStEnter））{RES＝TCPPtRead（XistelSokes）Et，and PUBMTCPFrime[ iByTeStEnt]，USTCPLSITION-iByTestEnter；}开关（RES）{案例0：PRVVBPORTRAXASECIENT（）；BabORT=真；中断；默认：iBytEthTe++Res；Burt；}（（iBythess）！= USTC长度）& & &！BabReSt= = iBytheSt= = USTC长度？真的：false；返回bFrAMEST；}任何人都可以帮助这些FrimoDeBUS库吗？有什么建议吗？



      以下为原文

    Thanks for your reply. I'm using FreeModbus libraries and, by this time, I can open a TCP socket from my client device. I'm having problems packaging frames to send. I'm trying to use the function:
 
eMBErrorCode eMBTCPSend( UCHAR _unused, const UCHAR * pucFrame, USHORT usLength )
{
eMBErrorCode eStatus = MB_ENOERR;
UCHAR *pucMBTCPFrame = ( UCHAR * ) pucFrame - MB_TCP_FUNC;
USHORT usTCPLength = usLength + MB_TCP_FUNC;

pucMBTCPFrame[MB_TCP_LEN] = ( usLength + 1 ) >> 8U;
pucMBTCPFrame[MB_TCP_LEN + 1] = ( usLength + 1 ) & 0xFF;
if( xMBTCPPortSendResponse( pucMBTCPFrame, usTCPLength ) == FALSE )
{
eStatus = MB_EIO;
}
return eStatus;
}
 
Which implies:
 
BOOL xMBTCPPortSendResponse( const UCHAR * pucMBTCPFrame, USHORT usTCPLength )
{
BOOL bFrameSent = FALSE;//Flag de trama enviada
BOOL bAbort = FALSE;
WORD res;//Bytes que se pueden escribir en el buffer
int iBytesSent = 0;//Bytes enviados
int iTimeOut = MB_TCP_READ_TIMEOUT;//Tiempo para timeout
do
{
res = TCPIsPutReady( xListenSocket );
if(res > (usTCPLength - iBytesSent)){
res = TCPPutArray(xListenSocket,&pucMBTCPFrame[iBytesSent], usTCPLength - iBytesSent);
}
switch ( res )
{
case 0:
prvvMBPortReleaseClient( );
bAbort = TRUE;
break;
default:
iBytesSent += res;
break;
}
}
while( ( iBytesSent != usTCPLength ) && !bAbort );
bFrameSent = iBytesSent == usTCPLength ? TRUE : FALSE;
return bFrameSent;
}
 
Anyone can help with these freemodbus libraries? Any suggestion?