TP-UART-IC

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25.15.10.41.33a

25.10.01

page

19

3.2.3.2 Services from UART

The first character of each service which is sent to the host controller is the control field. The

control field contains the information about the TP - UART-Service. There are 3 types of

services which can be send to the host controller: the EIB-Layer-2-Services, the Immediate-

Acknowledge-Services and the special TP – UART - Services. The EIB-Layer-2-Services

contain information about their class and also a flag which contains the information whether

the LPDU is a repeated one, or not. The Immediate-Acknowledge-Services include

information about a successful sending. The TP – UART - Services are to inform the host

controller about the communication state or to reset the communication.

Control Field

7 6 5 4 3 2 1 0

Layer-2 Services

1 0 r 1 c1 c0 0 0 L_DATA.ind

c1

c0

0 0 r 1 c1 c0 0 0 L_LONG_DATA.ind

0

0

system priority

1 1 1 1 0 0 0 0 L_Poll_Data.ind

1

0

alarm priority

Immediate Acknowledge Services

0

1

high priority

1 1 0 0 1 1 0 0 Acknowledge frame

1

1

low priority

0 0 0 0 1 1 0 0 NotAcknowledge frame

1 1 0 0 0 0 0 0 Busy frame

EIBUART-Control-Services

0 0 0 0 0 0 1 1 Reset-Indication

x x x x x 1 1 1 State-Response/Indication

x 0 0 0 1 0 1 1 L_DATA.confirm

x = 1 Positive Confirm x = 0 Negative Confirm

repeat flag = 0: repeated L_DATA frame

repeat flag = 1: not repeated

3.2.3.2.1 Layer-2-Services

The Layer-2-Services include all standard EIB Link-Layer-Services. The control fields are

followed by the data of the EIB frame. All bytes received on the EIB are immediately sent to

the host controller. The host controller has to detect a end of packet time out by supervising

the EOP gap of 2 to 2.5 bittimes.

control field

FFR1 cc00

Hexadecimal

long/normal

data link frame type

class

Repeat flag

(0 = repeated)

FF11 0000

L_DATA request

system

Not repeated

FF01 0000

L_DATA request

system

Repeated

FF11 1000

L_DATA request

alarm

Not repeated

FF01 1000

L_DATA request

alarm

Repeated

FF11 0100

L_DATA request

high

Not repeated

FF01 0100

L_DATA request

high

Repeated

FF11 1100

L_DATA request

normal

Not repeated

FF01 1100

L_DATA request

normal

Repeated

1111 0000

L_POLLDATA request

system

The frame format 01 is not supported.

For a complete description of the Link-Layer service see the EIB - Handbook.