Technical data

PAGE 63

Interfaces

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.

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. 10 PIN ASSIGNMENT: RS-232-INTERFACE

Connector: RS232C (SUB-D, 9-pole, male)

Pin Signal Electrical Characteristics

1Not usedType: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

2RXDReceive Data

3TXDTransmit Data

4 DTR Data terminal ready

5GNDGround

6 DSR Data set ready

7 RTS Request to send

8CTSClear to send

9Not used

TAB. 11 PIN ASSIGNMENT: USER I/O-INTERFACE

Connector: TTL USER-I/O (SUB-D, 9-pin, male)

Port Signal Electrical Characteristics

1MSN switchover input

+5V: MSN-1 (level without switching)

GND: MSN-2

Level: TTL/CMOS

Rating: 20 mA

2 Used for relay 1

3 TTL 3 IN/OUT

4 Used for relay 2

5GND

6 TTL 5 IN/OUT

7 used for relay 3

8 TTL 7 IN/OUT

9 TTL 8 IN/OUT