15
3.2.2
TTL/Relay interface
The TTL/relay interface is realised as a 25-pin socket. It provides eight TTL
inputs/outputs as well as eight relay contacts. This interface can be used for
external signalling of alarms. The programming of the available functions is possible
via the Windows PC Software.
Pin assignment: TTL/RELAY INTERFACE
Socket: SUB-D 25-pin
Pin Signal
Electrical characteristics
1
TTL 1
output
TTL interface:
Capacity of the TTL outputs:
Maximum voltage: 3.3V
Maximum current: 10mA
Relay interface:
Capacity of the relays:
Maximum voltage: 48V
Maximum current: 200mA
2
TTL 2
output
3
TTL 3
output
4
TTL 4
output
5
TTL 5
output
6
TTL 6
output
7
TTL 7
output
8
TTL 8
output
9
RELAY 4 (B)
output, NO
10
RELAY 5 (B)
output, NC
11
RELAY 6 (B)
output, NC
12
RELAY 7 (B)
output, NO
13
RELAY 8 (B)
output, NO
14
RELAY 1 (A)
output, NC
15
RELAY 1 (B)
output, NC
16
GND
17
RELAY 2 (A)
output, NC
18
RELAY 2 (B)
output, NC
19
RELAY 3 (A)
output, NO
20
RELAY 3 (B)
output, NO
21
RELAY 4 (A)
output, NO
22
RELAY 5 (A)
output, NC
23
RELAY 6 (A)
output, NC
24
RELAY 7 (A)
output, NO
25
RELAY 8 (A)
output, NO
NO = normally open
NC = normally closed
