13
Call Signal Connections for other 4-wire Communications Systems
4-wire Call Send and Call Enable/Inhibit
The DSI 2008 accepts a switch-contact input from the 4-wire system and then generates a call signal output to the 2-wire
system. The DSI 2008 also accepts an optional switch contact input to enable or inhibit call signaling between the 4-wire and
2-wire systems. Figure 6 shows the typical connections.
GPI OUTPUT NUMBERSa
a. Dependent on UIO-256 DIP Switch SW1 Settings for Input/Output Range as summarized in the UIO-256 manual.
RELAY CONTACT PIN NUMBERS
UIO-256
FRAME #1 UIO-256
FRAME #2 UIO-256
FRAME #3 UIO-256
FRAME #4
NORMAL
CLOSED
(NC)
CONTACT
COMMON
CONTACT
NORMAL
OPEN (NO)
CONTACT
1 17 33 49381340
2 18 34 50391415
3 19 35 51411643
4 20 36 52421718
5 21 37 53441946
6 22 38 51452021
7 23 39 55412249
8 24 40 56482324
925415726128
10 26 42 58 27 2 3
11 27 43 59 29 4 31
12 28 44 60 30 5 6
13 29 45 61 32 7 34
14 30 46 62 33 8 9
15 31 47 63 35 10 37
16 32 48 64 36 11 12
FIGURE 6. Typical call send and call enable/inhibit connections for a 4-wire intercom system.