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Read String Function (4403) This function causes characters to be read from the specified port until a specified terminating character is received. The characters are read from the internal input buffer and placed in the specified input data area. The function returns both the number of characters retrieved and the number of unprocessed characters still in the input buffer. If zero characters of input are requested,0nly the number of unprocessed characters in the input buffer is returned. If the terminating character is not in the input buffer, the status of the operation is not complete until either the terminating character has 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. If the time-out interval is set to zero, the COMMREQ remains pending until it has received the requested string, terminated by the specified end character.

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