15
3.3
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.
Pin assignment: TTL/Relay interface
Socket: SUB-D 25-pin
Pin
Signal
Electrical characteristics
1
TTL 1
input/output
2
TTL 2
input/output
3
TTL 3
input/output
4
TTL 4
input/output
5
TTL 5
input/output
6
TTL 6
input/output
7
TTL 7
input/output
8
TTL 8
input/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 contact
NC = normally closed contact
