FMUser RDS-C - Page 45

FMUSER INTERNATIONAL GROUP INC. 广州市汉婷生物技术开发有限公司
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13.1.4 The UECP implementation in the RDS-C, its characteristics and limitations
MEC
Meaning Notes
01 PI
02 PS
03 TA/TP
04 DI/PTYI
05 MS
07 PTY
0A RT 1
0D Real time clock
13 AF 2
24 Free-format group 3, 4
30 TMC 3, 5
40 ODA configuration and short message command 3, 6
42 ODA free-format group 3, 7
Field Handling
ADD Site address 0-255, Encoder address 0-63, note 7.
SQC Ignored
DSN Ignored
PSN Ignored
Notes:
1) Text transferred to RT1. Control bits 1 to 7 are ignored.
2) Start location ignored.
3) Buffer size 4 groups (FIFO type), shared by all ODA, TMC and free-format Message elements. Number of repeats is
assigned to each group in the FIFO buffer so one group occupies one position in the buffer regardless
of number of repeats.
Important: If using any of the MEC 24, 30, 40 or 42, the space for ASCII command UDG2 is automatically limited
to max. 3 groups.
4) Buffer configuration bit 5 ignored. Buffer configuration bit 6 meaning: 0 – no repeat, 1 – repeat the group one
time, then clear.
5) Full support except the priority and buffer configuration. When inserting more TMC groups at once, the
encoder automatically assures 3 group long gap between two different TMC groups in the data transmitted.
6) Timeout and buffer configuration ignored. Always inserts one group through the FIFO buffer.
7) Priority, mode and buffer configuration ignored. Always inserts one group through the FIFO buffer.
8) Other MEC's are ignored, incl. all possible Message elements that may follow within the same Message field.
Due to mistake in the UECP specification (unknown Message element length in general) it's recommended not
to insert more than one Message element inside each Message field to maintain compatibility.
9) The RDS encoder address list can contain only two items for the Site address and two items for the Encoder
address. One of these items is always set to 0, the second can be set using the commands *SITE= and *ADR=.
The UECP communication is always unidirectional. There are no responses sent to the UECP records.
When the UECP is enabled, the RDS encoder accepts any mixture of ASCII commands and UECP records on
the same communication port.
Any characters which follow the UECP start byte (0xFE) will be ignored by the ASCII command interpreter until one
of the following conditions occurs:
• reception of the UECP stop byte (0xFF)
• reception of 260 characters
• COM port timeout (2 minutes)
For this reason take care not to send the UECP start byte within an ASCII command when the UECP is enabled.