TP-UART-IC

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25.15.10.41.33a

25.10.01

page

20

Each L_Data-request is transmitted completely to the host controller. If TP - UART is polling

master the complete polling frame is transmitted to the host controller and regardless of

whether a collision is detected while sending the polling frame, or not. In case TP - UART is

polling slave just the control byte out of L_PollData-request is transmitted to the host

controller.

3.2.3.2.2 Acknowledge-Services

Acknowledge-Services are just transmitted to the host controller in busmonitor mode.

The short acknowledgment frame format consists of 15 Tbit (1 Tbit = 1/9600 s) idle time

followed by a single character which is used to acknowledge a L_Data.req frame. The

following figure shows the corresponding codes of the short acknowledgment.

Octet 0

Short ACK

8

7

6

5

4

3

2

1

1

1

0

0

1

1

0

0

ACK

0

0

0

0

1

1

0

0

NACK

1

1

0

0

0

0

0

0

BUSY

3.2.3.2.3 TP-UART-Control-Services

The TP-UART-Control-Services are services which exist only on this interface. They have to

reset the communication or to inform the host controller about the actual state.

3.2.3.2.3.1TP-UART-Reset.indication-Service

The Reset.indication-Service is sent after each reset (e.g. TP_UART_Reset.requ).

TP-UART-Control Field

7

6

5

4

3

2

1

0

0

0

0

0

0

0

1

1

3.2.3.2.3.2TP-UART-State.indication/response-Service

The TP-UART-State.response-Service is sent if an U_State.request-Service was received

from the host controller. In case of a slave collision, receive error, checksum error or

protocol error the TP-UART-IC sends a State.indication-Service.

TP-UART-Control Field

7

6

5

4

3

2

1

0

SC

RE

TE

PE

TW

1

1

1

SC

= Slave Collision

RE

= Receive Error (checksum, parity or bit error)

TE

= Transmitter Error (send 0 receive 1)

PE

= Protocol Error (e.g. illegal control byte)

TW

= Temperature Warning

1)

1)

After a temperature warning was received, a second must at least be maintained until the next

telegram is sent.