TC8000 4 to 8CH Audio/Intercom
User's Manual
Rev. 7.0
MNL-80000-01-70
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Figure 11. RS-422/RS-485 Async Pin Assignments & Virtual Connection Diagrams
Figure 10. RS-232 Async & Sync Pin Assignments & Virtual Connection Diagram
RS-422/RS-485 Asynchronous (Optional)
For RS-422 & RS-485 interfaces, pins 2 and 5 are balanced input pins. Pin 2 is the positive input
(TxD+) while pin 5 is negative (TxD-).
Pins 3 and 4 are balanced output pins. Pin 3 is the positive output (RxD+) while pin 4 is negative
(RxD-). Either pin 6 or pin 1 can be Signal Ground.
Only RS-422/RS-485 Async communications can be used with the TC8000 due to the limited
number of pins on the RJ-11 connector.
RS-232 (Async with Control & Sync)
For RS-232 interfaces, pin 5 is the input (TxD) pin while pin 4 is the output (RxD) pin. A separate
channel on each RJ-11 port is available on pin 3 and pin 2 (for Async with Control or Sync
interfaces). The second channel can be used as control (or handshake) signals or Tx Clock and
Rx Clock signals for RS-232 synchronous applications.
