Editing Radio Data System (section)

=== RDS message examples ===
These are non-comprehensive examples that cover just the simple messages like station name, radio text, and date/time.

==== Group type 0 – Version B – Station name ====
{| class="wikitable"
|-
|Version 
| colspan="2" |Block 1 : 26bits
| colspan="10" |Block 2 : 26bits
| colspan="2" |Block 3 : 26bits
| colspan="3" |Block 4 : 26bits
|-
|Block Internal
|PI Code
|Check + Offset A
|GTYPE
|B0
|TP
|PTY
|TA
|M/S
|DI
|C1
|C0
|Check + Offset B
|PI Code
|Check + Offset C'
|Character A
|Character B
|Check + Offset D
|-
|Bit Value
|16 bits
|
|0000
|1
|X
|XXXXX
|X
|X
|X
|X
|X
|
| 16 bits
|
|8 bits char
|8 bits char
|
|}
As we have already described previous fields above, these dot points below show just the application specific fields.
* TA : Traffic Announcement
* M/S : Music/Speech
The station name and decoder identification code is sent progressively over 4 groups, where the offset is defined by bit C1 and C0.
{| class="wikitable"
| colspan="2" |Character Segment
|
| colspan="8" |Station Name :
| colspan="4" |Decoder Identification Code : 4 bit
|-
|C1
|C0
|Offset
|0
|1
|2
|3
|4
|5
|6
|7
|3
|2
|1
|0
|-
|0
|0
|0
|A
|B
|
|
|
|
|
|
|DI
|
|
|
|-
|0
|1
|1
|
|
|A
|B
|
|
|
|
|
|DI
|
|
|-
|1
|0
|2
|
|
|
|
|A
|B
|
|
|
|
|DI
|
|-
|1
|1
|3
|
|
|
|
|
|
|A
|B
|
|
|
|DI
|}

==== Group type 2 – Radio text ====
{| class="wikitable"
|-
|RadioText Version A 
| colspan="2" |Block 1 : 26bits
| colspan="10" |Block 2 : 26bits
| colspan="3" |Block 3 : 26bits
| colspan="3" |Block 4 : 26bits
|-
|Block Internal
|PI Code
|Check + Offset A
|GTYPE
|B0
|TP
|PTY
|A/B
|C3
|C2
|C1
|C0
|Check + Offset B
|Character A
|Character B
|Check + Offset C
|Character C
|Character D
|Check + Offset D
|-
|Bit Value
|16 bits
|
|0010
|0
|X
|XXXXX
|X
|X
|X
|X
|X
|
|8 bits char
|8 bits char
|
|8 bits char
|8 bits char
|
|}
{| class="wikitable"
|-
|RadioText Version B 
| colspan="2" |Block 1 : 26bits
| colspan="10" |Block 2 : 26bits
| colspan="2" |Block 3 : 26bits
| colspan="3" |Block 4 : 26bits
|-
|Block Internal
|PI Code
|Check + Offset A
|GTYPE
|B0
|TP
|PTY
|A/B
|C3
|C2
|C1
|C0
|Check + Offset B
|PI Code
|Check + Offset C'
|Character C
|Character D
|Check + Offset D
|-
|Bit Value
|16 bits
|
|0010
|1
|X
|XXXXX
|X
|X
|X
|X
|X
|
|16 bits
|
|8 bits char
|8 bits char
|
|}

As we have already described previous fields above, these dot points below show just the application specific fields.
* A/B : Text A/B flag is used to detect if a screen clear is requested.
* C3 to C0 : Is the text segment offset value
The station name and decoder identification code is sent progressively over 4 groups, where the offset is defined by bit C1 and C0.
{| class="wikitable"
| colspan="4" |Text Segment
|
| colspan="4" |Version A
| colspan="4" |Version B
|-
|C3
|C2
|C1
|C0
|Offset
|Char A
|Char B
|Char C
|Char D
|Char A
|Char B
|Char C
|Char D
|-
|0
|0
|0
|0
|0
|1
|2
|3
|4
| colspan="2" rowspan="5" |Version B Specifies 
That This Field Is For

Program Identification

Code
|1
|2
|-
|0
|0
|0
|1
|1
|5
|6
|7
|8
|3
|4
|-
|0
|0
|1
|0
|2
|9
|10
|11
|12
|5
|6
|-
|...
|...
|...
|...
|etc...
|...
|...
|...
|...
|...
|...
|-
|1
|1
|1
|1
|15
|61
|62
|63
|64
|31
|32
|}

==== Group type 4 – Version A – Clock time and date ====
{| class="wikitable"
|-
|Version
| colspan="2" |Block 1: 26 bits
| colspan="9" |Block 2: 26 bits
| colspan="2" |Block 3: 26 bits
| colspan="2" |Block 4: 26 bits
|-
|Block Internal
|PI Code
|Check + Offset A
|GTYPE
|B0
|TP
|PTY
|R
|R
|R
|Time/Date Data
|Check + Offset B
|Time/Date Data
|Check + Offset C'
|Time/Date Data
|Check + Offset D
|-
|Bit Value
|16 bits
|
|0100
|0
|X
|XXXXX
|
|
|
|2 bits
|
|16 bits
|
|16 bits
|
|}
When group type 4A is used, it shall be transmitted every minute according to EN 50067.

The clock time group is inserted so that the minute edge will occur within ±0.1 seconds of the end of the clock time group.

Time and date are packed as these:
{| class="wikitable"
|Time/Date Data
| colspan="8" |Half Block 2 Payload
| colspan="16" |Block 3 Payload
| colspan="16" |Block 4 Payload
|-
|Payload Bit Pos
|7 ||6 ||5 ||4 ||3 ||2 ||1 ||0
|15 ||14 ||13 ||12 ||11 ||10 ||9 ||8 ||7 ||6 ||5 ||4 ||3 ||2 ||1 ||0
|15 ||14 ||13 ||12 ||11 ||10 ||9 ||8 ||7 ||6 ||5 ||4 ||3 ||2 ||1 ||0
|-
|Field Bit Pos
| colspan="3" rowspan="2" |etc...
| colspan="3" |Reserved
|16 ||15 ||14 ||13 ||12 ||11 ||10 ||9 ||8 ||7 ||6 ||5 ||4 ||3 ||2 ||1 ||0
|4 ||3 ||2 ||1 ||0
|5 ||4 ||3 ||2 ||1 ||0
|± ||4 ||3 ||2 ||1 ||0
|-
|Description
| colspan="3" |Reserved
| colspan="17"|[[Modified Julian Day]] Number
| colspan="5" |UTC Hours (0–23)
| colspan="6" |UTC Minutes (0–59)
| colspan="6" |Local Time Offset
|}
Note: The local time offset is expressed in '''''multiples of half hours''''' within the range −15.5h to +15.5h. It is expressed in [[Signed magnitude#Signed magnitude representation|signed magnitude]] form, with the most significant bit being the "Local Offset [[Sign bit|Sign" bit]] (LOS), 0 = + (east of [[Greenwich mean time|Greenwich]]), 1 = −.