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A2.2
RS232C-Interface
The RS232C interface is used for configuring and monitoring the MAGIC
ISDN Telephone Hybrid system with a PC. To connect the system to the PC a
null modem cable, in which pin 2 and pin 3 are crossed is required. Addition-
ally, pin 5 GND, must be connected. All other pins are not essential.
TAB. 10
1
5
Connector: RS232C (SUB-D, 9-pole, male)
6
9
Pin
1
2
3
4
5
6
7
8
9
A2.3
TTL USER I/O Interface
External operating signals can be sent through this interface. Three signals are
always used to drive the relay within in the system.
TAB. 11
1
5
Connector: TTL USER-I/O (SUB-D, 9-pin, male)
6
9
Port
1
2
3
4
5
6
7
8
9
PIN ASSIGNMENT: RS-232-INTERFACE
Signal
Not used
RXD
Receive Data
TXD
Transmit Data
DTR
Data terminal ready
GND
Ground
DSR
Data set ready
RTS
Request to send
CTS
Clear to send
Not used
PIN ASSIGNMENT: USER I/O-INTERFACE
Signal
MSN switchover
input
+5V: MSN-1 (level without switching)
GND: MSN-2
Used for relay 1
TTL 3 IN/OUT
Used for relay 2
GND
TTL 5 IN/OUT
used for relay 3
TTL 7 IN/OUT
TTL 8 IN/OUT
I n t e r f a c e s
Electrical Characteristics
Type:
DTE
Level:
V.24
Data Rate:
19200 Baud
Transmission Range:max. 15 m
Protocol:
1 Start bit
8 Data bits
1 Parity bit
1 Stop bit
Electrical Characteristics
Level:
TTL/CMOS
Rating:
20 mA
P A GE 6 3
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