T and A Elektroakustik T-1210-R Owners manual

T Technische Mitteilungen

RS232 control of the FM-Tuner T 1210 R

The T1210R can be controlled by any control device having a RS232 serial output port (PC,
CRESTRON home automation system etc.) through the T+A RS232/R-Link interface adaptor.

For details about connecting and operating the adaptor see the user manual of the adaptor
“UM_RS232_Adapt.doc”.

Settings for the RS232 interface of the control device are as follows:

Baudrate: 115.200
Data Bits: 8
Stop Bits: 1
Parity: none
Flow Control: none

T+A RS_232 Protocol

The T1210R uses the standard T+A RS232 command protocol as described in detail in the documents
“TA_RS232_protocol.doc” and “RS_232_Command_Codes.doc”.

Format of the command telegrams

A command telegram to the T1210R consists of 6 bytes. The complete telegram should be sent
without pauses between the bytes.

Example: SYSTEM_ON command

Byte 1 Byte 2 Byte 3 Byte 4 Byte 5 Byte 6
RS232
adaptor
Address

R-Link command
length

(R-Link address + R-Link
command + R-Link flag
byte = 0x03)

R-Link
Address

(0x24=TUNER)

R-Link command

(here: NEXT = 0x34)

*see table
T1210R commands

R-Link flag
byte

check sum

=

sum of bytes 1..5 mod.
0xFF

0x01 0x03

0x24

(see below)

0x34 0x02 0x5E

Byte 1, 2, 3, 5 : for the T1210R these bytes have the fixed values as shown in the table below.

Byte 4 : R-Link command according to the table of RCII commands

(see List of T1210R commands below)

Byte 6 : check sum == (byte1+byte2+byte3+byte4+byte5) modulo 0xFF

Format of the acknowledge (ACK) telegrams

The T1210R will process each received command telegram and it will send an acknowledge telegram approx.

25...35 ms after receiving the command.

The ACK telegram consists of 2 bytes:
Byte_1 is the RS232 address of the command telegram received before (=byte 1 of the command telegram =
0x01).
Byte_2 is the acknowledge byte. If this byte is equal to the check sum of the command telegram (byte6 of the
command) then the command was received correctly.
If byte 2 has a value different from the check sum of the command, an error has occurred (see table below).

Format of the ACK telegram:

Byte 1 Byte 2
RS232 address ACK byte

0x01

= check sum of command: command correctly received
= check sum –1: command ignored (system busy)
= check sum –2: command not executed
Note:
If no ACK telegram is received within 35 milli-seconds after sending a command, there is either a

hardware problem (cable etc.) or the telegram is erroneous (wrong address, wrong check sum ....)

After the ACK telegram, the T1210R is ready for the next command.

List of T1210R commands

Command Command

Code
(HEX)

toggle Remark

ON_OFF 0x01 x Switch Tuner ON or OFF

(toggle between ON & OFF)
Tuner ON 0x57 Switch Tuner ON
NEXT (>|) 0x34 Select next higer Preset
PREV (|<) 0x2A Select next lower Preeset
FastForward (>>) 0x25 Tuning step upwards
FastReverse (<<) 0x1A Tuning step downwards
OK 0x26
0 0x03
1 0x3A
2 0x06
3 0x16
4 0x02
5 0x09
6 0x3B
7 0x31
8 0x11
9 0x39

Direct numeric PRESET selection.

Note:
For Presets > 9 send two digits with approx.

100...200 ms space between the two digits.

F1/F2 0x32 x Function 1/2 (Wide/Narrow)

Note:
For a complete list of all R-Link source commands refer to the document
“RS_232_Command_Codes.doc”.