UNI is a very simple Master-Slave type protocol suitable, for example, for development work in Master-Slave networks. The CU in the RADIOSLAVE function is able to send an unchanged packet to a specific address. In the RADIOMASTER function it sends a response to the sender´s address upon request (without time limitation). The modem connected to the Slave PLC cannot send a packet to the MORSE network spontaneously, i.e. without a RADIOSLAVE's query.

Important

The terminology is unified from Setr version 9.0.17.0 according next schedule: PLC Master - CU RADIOSLAVE ... CU RADIOMASTER - Slave PLC CU (radiomodem) connected via SCC to PLC Master is called Radioslave (RS), CU connected to PLC Slave is called Radiomaster (RM). Changes appear at a new Setr version, the firmware version has not influence. The older Setr uses the reverse terminology, also: ( PLC Master - CU RADIOMASTER ... CU RADIOSLAVE - Slave PLC )

From firmware release 7.07 and up the UNI protocol in the Master function is able to send a broadcast type packet. The Slave does not send any reply after receiving the broadcast packet.

The protocol does not use a CRC.

The packet may contain arbitrarily arranged data, for example in the format of one of the Master-Slave protocols. The only condition is that a known position (nth byte) contains the lowest byte of the target Slave´s address. The number of this position is stored as parameter(a)of the UNI protocol.

There are no special requirements imposed on the format of the data entering the CU RM.

The UNI protocol uses only the lowest byte of the address. The other bytes are either added using a mask from the actual address of the node or whole MORSE addresses are prepared in the Art conversion table.

Example of sending a packet from the CU RADIOSLAVE,

An 8-bit mask is used for creating a MORSE address:

        RS          data          RM 
      69AABBFF ---------------> 69AABB22
                 112233AAAA

Parameters:

UNI parameters:
PLC Master - CU RADIOSLAVE ... CU RADIOMASTER - Slave PLC
(m)ode :RADIOSLAVE (wired to master)
(a):2
(A)ddress mode:BINARY (1 Byte)

>>
Monitoring: source 69AABBFF|4.
10:29:56.325 rxsim   5 | S00
1122 33AA AA
10:29:56.340|                 |00000022 000000FF|S00I   OUT   5| 89 0user
1122 33AA AA
Monitoring: source 69AABB22|2.
10:29:56.342|                 |00000022 000000FF|S01I    IN   5|89 6user
1122 33AA AA
10:29:56.342 tx      5 | S01
1122 33AA AA

According to parameter (a) the second byte of data was selected and inserted as the lowest byte of the destination address.

Data was received from the source address 69AABBFF, and therefore the nearest data, which entered through the SCC01 port, is sent by protocol RM to this address:

>>
Monitoring: source 69AABB22|3.
10:30:32.874 rxsim   2 | S01
BBBB
10:30:32.889|                 |000000FF 00000022|S01I   OUT   2| 89 0user
BBBB
Monitoring: source 69AABBFF|7.
10:30:32.891|                 |000000FF 00000022|S00I    IN   2|89 1user
BBBB
10:30:32.892 tx      2 | S00
BBBB

Transmitting to a broadcast address,

The address is configurable, e.g. 127 = 0x7F:

Parameters:

PLC Master - CU RADIOSLAVE ... CU RADIOMASTER - Slave PLC
(m)ode :RADIOSLAVE (wired to master)
(a):2
(A)ddress mode:BINARY (1 Byte)
(b)roadcast:ON  (B)roadcast Address:127
(C)TS sig:OFF   T(1):0ms        T(2):0ms

Monitoring:

11:06:48.483 rxsim   5 | S00
117F 33AA AA
11:06:48.498|                 |0000007F 000000FF|S00I  OUT 5||89 0user brc
117F 33AA AA
RF mon      |toa      frm     |dst      src     |lNo!DQ!RSS size|TT N
11:06:48.529|69AABBFF 69AABBFF|69AAB87C 69AABBFF|008  RFTX    5 09 4datbrc

Data 117F33AAAA is addressed for 0x7F (127 dec). This coincides with the Broadcast address, which is why it is sent to the network with a set BRC bit.

Note - the appropriate parameters must be filled in in the Broadcast menu.

In RADIOMASTER mode the modem has broadcast switched on in the UNI protocol parameters. The Broadcast address does not need to be filled in. The RADIOMASTER does not expect any reply to Broadcast data from SCC. If any arrives it is discarded.

PLC Master - CU RADIOSLAVE ... CU RADIOMASTER - Slave PLC
(m)ode :RADIOMASTER (wired to slave)
(a):0
(A)ddress mode:BINARY (1 Byte)
(b)roadcast:ON (B)roadcast Address:0
(C)TS sig:OFF   T(1):0ms        T(2):0ms

Use of the CTS signal

Switching on the CTS parameter causes the CTS signal to be set up when sending data to the port with a lead of T1 and a lag of T2 ms.

11:33:42.524|                 |00000022 000000FF|S01I    IN   5|*89 6user 
1122 33AA AA
11:33:42.525 ---     0 | S01;CTS ON
11:33:42.529 tx      5 | S01
1122 33AA AA
11:33:42.536 ---     0 | S01;CTS OFF

The main parameters are Master-Slave resolution and for the CU RADIOSLAVE parameter (a) which defines the byte number of data containing the destination address.

UNI parameters:
PLC Master - CU RADIOSLAVE ... CU RADIOMASTER - Slave PLC
(m)ode :RADIOSLAVE (wired to master)
(a):5
(A)ddress mode:BINARY (1 Byte)
(b)roadcast:ON  (B)roadcast Address:127
(C)TS sig:OFF    T(1):0ms        T(2):0ms
Accept (r)epeats:OFF     (t)imeout:0ms
Check (N)etNo:OFF
(q)uit
>>

An example of using parameter (A)dd with value (H):

UNI parameters:
PLC Master - CU RADIOSLAVE ... CU RADIOMASTER - Slave PLC
(m)ode :RADIOSLAVE (wired to master)
(a):2
(A)ddress mode:ASCII/HEX (2 Bytes)

>>
10:39:57.905 rxsim   5 | S00
1161 62CC CC
10:39:57.921|                 |000000AB 000000FF|S00I   OUT    5| 89 0user
1161 62CC CC

ASCII data 61 62 was transferred as 0xAB and a packet was sent to this address.