17
MTA type connectors and they fit all three module types. Use care when inserting
and removing these connectors. When using a 4-Wire module, the 3-pin power
connector is not used since no power is required. Be careful to locate this jumper
in a location where it will not cause an electrical short with other components.
To change an intercom module in the assembly:
1. Turn the power OFF.
2. Remove the four screws that attach the module to the 882i frame.
3. Pull the module half-way out and disconnect the two multi-conductor
cables.
4. Remove module.
5. Carefully insert the new module half-way and attach the two multi-
conductor cables.
6. Re-install the four mounting screws.
7. Turn the power ON.
Digital Data
Digital signal connections are made via the 9-pin “D” connectors described in
Table 6 and illustrated in Figure 11. A 110 W terminating resistor placed across
the balanced inputs may be needed if cable lengths using 110 W twisted pairs
are in excess of 6 feet. The serial communications protocol can be RS-232 at
one end and RS-422 at the other, if desired.
Contact closure input is activated by connecting it to ground. Contact closure
output is an isolated dry contact.
If SONY CCU interface operation is selected, RS-422 and RS-232 functions are
not available at that connector
The digital I/O “D”connector is AMP 747905-2.
Connectors 5-8 (Right)
PIN #
Connectors1-4 (Left)
Serial Comm
CCU Data
1
RS422 in (-)
RS422 in (-)
No Connection
2
Contact Out
No Connection
CCU I/O
Jumper to Pin 6
3
Ground
Ground
Ground
4
RS-232 Out
RS-232 Out
No Connection
5
RS-422 Out (-)
RS-422 Out (-)
Jumper to Pin 8
6
RS-422 In (+)
RS-232 In
RS-422 In (+)
RS-232 In
CCU I/O
Jumper to Pin 2
7
Contact Out
No Connection
No Connection
8
Contact In
No Connection
Jumper to Pin 5
9
RS422 out (+)
RS422 out (+)
No Connection
Table 6: Data Connections