Ttl/Relay Interface - AVT MAGIC EEC Hardware Manual

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
1 TTL 1
2 TTL 2
3 TTL 3
4 TTL 4
TTL 5
5
6 TTL 6
TTL 7
7
8 TTL 8
9 RELAY 4 (B)
10 RELAY 5 (B)
11 RELAY 6 (B)
12 RELAY 7 (B)
13 RELAY 8 (B)
RELAY 1 (A)
14
15 RELAY 1 (B)
GND
16
17 RELAY 2 (A)
18 RELAY 2 (B)
19 RELAY 3 (A)
20 RELAY 3 (B)
21 RELAY 4 (A)
22 RELAY 5 (A)
23 RELAY 6 (A)
24 RELAY 7 (A)
25 RELAY 8 (A)
NO = normally open
NC = normally closed
Electrical characteristics
output TTL interface:
output Capacity of the TTL outputs:
Maximum voltage: 3.3V
output
Maximum current: 10mA
output
output
Relay interface:
output
Capacity of the relays:
output
Maximum voltage: 48V
output
Maximum current: 200mA
output, NO
output, NC
output, NC
output, NO
output, NO
output, NC
output, NC
output, NC
output, NC
output, NO
output, NO
output, NO
output, NC
output, NC
output, NO
output, NO
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