DS200QTBAG1ACB工控DCS系统

产品标题: DS200QTBAG1ACB工控DCS系统模块卡件自动化设备

型号： DS200QTBAG1ACB

品牌：GE

                                                                              产品详情资料：

如果没有足够的字符来满足请求，并且为要读取的字符数指定了非零值，则在收到足够的字符或超时间隔到期之前，操作状态不会完成。在这两种情况中，端口状态都表示读取操作完成的原因。在读取操作完成之前，状态字不会更新（由于超时或接收到所有数据）。如果超时间隔设置为零，COMMREQ将保持挂起状态，直到它接收到请求的数据量，或者直到它被取消。如果此COMMREQ因任何原因失败，则没有数据返回到输入数据区。任何尚未从内部输入缓冲区读取的数据都会保留下来，可以通过后续的读取请求来检索。

                         产品英文详情料:

If insufficient characters are available to satisfy the request and a non-zero value is specified for the number of characters to read, the status of the operation is not complete until either sufficient characters have been received or the time-out interval expires. In either of those conditions, the port status indicates the reason for completion of the read operation. The status word is not updated until the read operation is complete (either due to timeout or when all the data has been received). If the time-out interval is set to zero, the COMMREQ remains pending until it has received the requested amount of data, or until it is cancelled. If this COMMREQ fails for any reason, no data is returned to the input data area. Any data that has not been read from the internal input buffer remains and it can be retrieved with a subsequent read request.

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