Note: Obviously, two devices which are communicating together must be set so that one has High
priority and the other has Low.
•
BCC
List box: On, Off
Default = On
BCC (Block Check Character) is a control byte used for data integrity control, it makes the reliability
higher. BCC is used by 3964R, 3964 does not use it.
The unit checks (calculates itself) this byte while receiving a packet on COM. Unit transmits DLE
(accepts the frame) only when the check result is OK. The BCC byte is not transferred over the
network, it is calculated locally in the end Unit and appended to the received data.
UNI
UNI is the "Universal" protocol utility designed by RACOM. It is supposed to be used when the applic-
ation protocol is not in the Unit list. The key condition is that messages generated by the Master applic-
ation 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 the UNI protocol: In the first one, communication
always has to be 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 packet 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.
Underlined parameters are described in
•
Address mode
List box: Binary (1 B), ASCII (2 B), Binary (2B LSB first). Binary (2B
MSB first).
Default = Binary (1 B)
M!DGE/MG102i/RipEX reads the Protocol address in the format and
length set (in bytes).
The ASCII 2-byte format is read as 2-character hexadecimal represent-
ation 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 ad-
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© RACOM s.r.o. – MG102iGPRS/UMTS/HSPA+/LTE router
Web Configuration
Summary of Contents for MG102i
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