Automatic control function programming manual ladder language

Description
The neti function works on ports 0x50 to 0x5F.
This function:
- Receives the answer to a request sent earlier on the network by neto(..)
- Receives an «unsolicited» request sent by a remote station.
Operation
When the neti(..) function is called, if the queue does not contain any requests with the same source port as in the call
to neti(..), the monitor returns to the calling programme with the NO_REQ return code «0x6».
If the size allocated for reception of the datagram is sufficient, the request is transferred to the address &datagram and
a return is made to the caller with the OK return code «0x0».
If the buffer size is insufficient, the return is made to the caller with the SMALL_BUFF return code «0x7».
It is possible to wait simultaneously for as many requests as there are source ports (16 answers to requests sent by
neto(..) or «unsolicited» requests).
Return Code
If OK
Code Report message
0x00 OK - Read correct
Error
Code Report message
0x04 Incorrect port number
0x06 No request received for this port
0x07 Buffer too small to store the answer
0x08 Invalid line number
0xFF Not in a background task
REMARK If the return code is 0x06, the neti(..) function must be called cyclically until the request
is received.
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