PAGE 28
Interfaces
A1.2.4 TTL/RELAY interface
The TTL/Relay interface is realised as a 25-pin socket. It provides 8 TTL inputs or outputs and 8 Relay contacts. The pin assignment of the socket is
shown in TAB. 4.
NO = Normally Open
A1.2.5 RS232/Keypad Interfaces
Not in use.
A1.2.6 Extension Bus
Not in use.
TAB. 4 PIN ASSIGNMENT: TTL/RELAY INTERFACE
Socket: SUB-D 25 pin
Pin Signal Direction Electrical characteristics
1 TTL 1 input/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 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, NO
11 RELAY 6 (B) output, NO
12 RELAY 7 (B) output, NO
13 RELAY 8 (B) output, NO
14 RELAY 1 (A) output, NO
15 RELAY 1 (B) output, NO
16 GND
17 RELAY 2 (A) output, NO
18 RELAY 2 (B) output, NO
19 RELAY 3 (A) output, NO
20 RELAY 3 (B) output, NO
21 RELAY 4 (A) output, NO
22 RELAY 5 (A) output, NO
23 RELAY 6 (A) output, NO
24 RELAY 7 (A) output, NO
25 RELAY 8 (A) output, NO
1
13
14
25