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A4.2
RS232C Interface
The RS232C interface is used for configuring and monitoring the MAGIC
ISDN Telephone Hybrid systems 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 required.
TAB. 15
1
5
Connector: RS-232C (SUB-D, 9-pole)
6
9
Pin
1
2
3
4
5
6
7
8
9
A4.3
TTL USER I/O Interface
External operating signals can be sent through this interface. Three signals are
always used to drive the relay within the system.
TAB. 16
1
5
Connector: TTL USER I/O (SUB-D, 9-pole)
6
9
Pin
1
2
3
4
5
6
7
8
9
When using Slave systems, this interface is also used for the hardware dongle
(Slave 1, Slave 2, Slave 3):
Pin 9: Master/Slave identification
0 (GND) = Slave, 1 (+5V) = Master
Pin 1, Pin 2 = Slave identification
Pin 2 = 0 and Pin 1= 0: Slave 1
Pin 2 = 0 and Pin 1=1: Slave 2
Pin 2 = 1 and Pin 1=0: Slave 3
PIN ASSIGNMENT: RS232 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 G E 14 5
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