T and A Elektroakustik K-6 Owners manual

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Technical Information 19.08.2005

RS232

The DVD-Surround-Receiver K6 with Crestron compatible software (see appendix 2) is compatible to be controlled by a connected control-system having a RS232 serial output port (PC, CRESTRON home automation system etc.) through the RS232/R-Link interface adapter. For details about connecting and operating the adapter see the user manual of the adapter “UM_RS232_Adapt.doc”.

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

Baud rate: 115.200 Data bits: 8 Stop bits: 1 Parity: none Flow Control: none

control of K6.

T+A RS_232 Protocol

The R-series devices use 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 R-system master device consists of 6 bytes. The complete telegram should be sent without pauses between the bytes.

Example: SYSTEM_ON command

Byte 1

RS232 adapter

address

(always 0x01) (R-Link address +

0x01 0x03 0xC8 0x57 0x02 0x25

Byte 1, 2, 3, 5

Byte 4

Byte 6

Note:

The R-Link address

There exist a few additional commands (system commands) for some special functions. For these commands the address information which is normally not necessary due to the fact that the status is automatically pushed after changing.

: these bytes have the fixed values as shown in the table above for all R-system

: R-Link command according to the table of RCII commands (see “RS_232_Command_Codes.doc”)

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

Byte 2

Telegram length

R-Link command +

R-Link flag byte =

0x03)

master devices

0xC8

is used for all standard amplifier commands.

0xC4

has to be used. Currently this is only needed for requesting the status

Byte 3

R-Link address

(0xC8=Amplifier /

Master device

Format of the acknowledge (ACK) telegrams

The R-System master device 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

telegram = 0x01).

Byte 2

(byte_6 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:

After the ACK telegram, the master device is ready for the next command.

is the RS232 address of the command telegram received before (=byte 1 of the command

is the acknowledge byte. If this byte is equal to the check sum of the command 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 ....)

Special System Commands

The software versions that include the “extended control” feature (see Appendix 2) will automatically ‘push’ status information about the K6 status. Additionally this status can be requested by sending the

(Status_1) or 0x43 (Status_2) to the RLink-address 0xC4

. Responses are as follows:

Status 1:

The STATUS_1 command to the master is answered by a 8 byte long status telegram having the following format:

command 0x64

0x01, 0x05, 0xC4, 0x64,

Status_Byte_1, Status_Byte_2, Status_Byte_3

Checksum

-----------------------------------|---------------------------------------------------------------------------|----------------HEADER (4) STATUS BYTES (3) CHK-SUM (1)

The 4 header bytes (0x01/0x05/0xC4/0x64) are constant. The 3 status bytes are defined as follows:

Status_Byte_1

b0 unused b1 Speaker_A 1:= speaker A output is ON b2 Speaker_B 1:= speaker B output is ON b3 unused b4 unused b5 unused b6 unused b7 unused

Status_Byte_2

Listen Source

(0...14)

b1 b2 b3

Recording Source

(0...14)

b5 b6 b7

0:= not defined 1:= CD 2:= TUNER 3:= TAPE 1 4:= TAPE 2 5:= TV/Video 6:= AUX 1 7:= AUX 2

8:= AUX 3 9:= DVD 10:= STB 11:= VCR 12:= AUX/AV 1 13:= AUX/AV 2 14:= DBR (Digital Radio) 15:= not def. / future use

Status_Byte_3

b0 Loudness 1:= Loudness ON b1 Flat 1:= Tone control OFF b2 unused b3 unused b4 unused b5 unused b6 Standby 1:= K6 in Standby b7 On 1:= K6 is ON

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