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A2.1.2
DATA/PAD interface
The DATA/PAD interface is used for the transmission of Program Associated Data
(PAD). The interface is realised compliant to IRT Recommendation
ATTENTION
Please note that the maximum number of PAD bytes per frame is 127. In this case
a baudrate of 115200 Baud must be configured.
!
To connect a standard PAD inserter you need a 1:1 connecting cable in which Pin
2 and Pin 3 are not crossed. Furthermore, Pin 5 GND must be connected.
NOTICE
Please note that the function of the Pins RXD and TXD - input or output - is deter-
mined by the interface type DCE or DTE. The pin assignment for Pin 2 is always
RXD and for Pin 3 it is always TXD.
TAB. 3
1
5
Socket: SUB-D, 9-pole
9
6
Pin
Signal
1
not used
b
RXD
2
c
3
TXD
4
not used
GND
5
6
not used
7
not used
not used
8
9
not used
a
DCE = Data Communication Equipment: to connect a PC a 1:1 cable is required
b
ATTENTION: On this Pin the MAGIC AE1 DAB transmits data
c
ATTENTION: On this Pin the MAGIC AE1 DAB receives data
1
Synchronous transmission mode: In the beginning of each ISO/MPEG frame the encoder transmit a
SYN character (0x16). To realise frame synchronous PAD insertion the connected PAD inserter must
transmit all data inside of this frame.
PIN ASSIGNMENT: DATA/PAD INTERFACE
Electrical characteristics
PC interface RS232:
PAD Receive Data
Type (Pin 2, 3): DCE
Level:
Data rate:
PAD Transmit Data
Range:
Protocol:
Earth
I n t e r f a c e s
1
.
a
V.24
115200 Baud
max. 15 m
programmable
PAG E 6 7
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