1616-920-03
8/28/2014
Rev: B
4
2.3.2 MMU II PIN ASSIGNMENTS
The table below indicates the pin out of the MMU II
J1 ‐ Data
J2 ‐ Audio
1
28 VDC
1
Polarized Key
2
Polarized Key
2
28 VDC
3
RS 485 HI
3
28V Dimmer Input
4
RS 485 LO
4
5V Dimmer Input
5
RS 485 HI
5
POTS Ring
6
RS 485 LO
6
POTS Tip
7
Unit ID #1
7
Ground
8
Unit ID #2
8
Ringer Audio HI
9
Unit ID #4
9
Ground
10
Unit ID #8
10
Phones HI
11
Spare I/O #1
11
Ringer
12
Ground
12
Ground
13
Ground
13
Mic HI
14
Spare I/O #2
14
Ground
15
Message Alert
15
Ground
16
Incoming Call
16
Ground
17
DTR Out
17
RS232 RX ‐ Reserved
18
Ground
18
Ground
19
DSR In
19
Key In
20
Ground
20
Ringer Audio LO
21
5V Dimmer Input
21
RS232 TX ‐ Reserved
22
14V Dimmer Input
22
Phones LO
23
28V Dimmer Input
23
Ground
24
MMU RS232 Input (RX)
24
Key Out
25
MMU RS232 Output
(TX)
25
Mic LO