■ UNI
UNI is the 'Universal' protocol utility designed by RACOM. It is supposed to be used when the ap-
plication protocol is not in the RipEX list and the addressed mode of communication is preferable
in the network (which is a typical scenario). The key condition is that messages generated by the
Master application device always contain the respective Slave address and that address (or its
relevant part) position, relative to the beginning of the message (packet, frame), is always the same
(Address position).
Generally two communication modes are typical for UNI protocol: In the first one, communication
has to be always initiated by the Master and only one response to a request is supported; in the
second mode, Master-Master communication or combination of UNI protocol with ASYNC LINK
protocol and spontaneous packets generation on remote sites are possible.
The UNI protocol is fully transparent, i.e. all messages are transported and delivered in full, without
any modifications. Italicised parameters are described in Common parameters.
Mode of Connected device
Master
○ Address mode
List box: Binary (1 B), ASCII (2 B), Binary (2B LSB first). Binary (2B MSB first).
Default = Binary (1 B)
RipEX reads the Protocol address in the format and length set (in Bytes).
The ASCII 2-Byte format is read as 2-character hexadecimal representation of one-byte
value. E.g. ASCII characters AB are read as 0xAB hex (10101011 binary, 171 decimal)
value.
○ Address position
Specify the sequence number of the byte, where the Protocol address starts. Note that
the first byte in the packet has the sequence number 1, not 0.
○ Address mask (Hex)
When the Address mode is Binary 2 Bytes, a 16-bit value is read from the SCADA protocol
message according to the Address mode setting (either the MSB or the LSB first), The
resulting value is then bit-masked by the Address mask and used as the input value for
SCADA to IP address translation (e.g. by a table). The default value of the Address mask
is FFFF, hence the full 16-bit value is used by default.
Example:
The Address mode is set to Binary (2B LSB first), the Address mask is set to 7FF0 and
the Address position is set to 2. The SCADA message starts with bytes (in hex) 02 DA
92 C3 .. The 2-Byte address is read as 0x92DA (note the LSB came first in the message),
Then 0x7FF0 mask is applied and the resulting value 0x12D0 (0x92DA & 0x7FF0) is
used as the input for the translation.
○ Poll response control
List box: On, Off
Default = On
"On" – The Master accepts only one response per a request and it must come from the
specific remote to which the request has been sent. All other packets are discarded. This
applies to the Master - Slave communication scheme.
159© RACOM s.r.o. – RipEX Radio modem & Router
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