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TC8116
User's Manual
Rev. 5.6D
TTL Asynchronous
Similar to the RS-232 interface, the TTL interface utilizes pin 5 for the input (TxD) pin while pin 4 is the output
(RxD) pin.
Figure 8. RJ-11 TTL Async Pin Assignments & Connection Diagram
Figure 9. Dry Contact Detector and Closure Logic Diagrams
Dry Contact Closure Detector & Relay Switch (optional)
For dry contact closure applications, the TC8116 can be used as either the Closure or Detector depending
on which pins are used. The transmitter side has a dry-contact closure detector as shown in the diagram
below. The receiver side has a dry-contact closure relay switch. The "close" and "open" status is controlled
by a relay switch inside the TC8116. It reflects the remote detector's "on" and "off" status.
The diagram below, illustrates the virtual pin connections for using the TC8116 as either a dry contact
Detector (Transmitter) or a dry contact Closure (Receiver). The RJ-11's pins 4 and 5 are closed at the
transmitter side, the status is reflected at the remote receiver's side RJ-11's pins 2 and 3. The relay switch
on the receiver's side is rated 0.4A DC switching current, with a max load rating of 24VA.
As an option, the relay switch on the receiver's side can be rated 1.8A DC switching current, and a load rating
of 108VA.
(TTL Async)
RJ-11 JACK
RJ-11 JACK
Tx Data
Tx Data
5
5
4
4
6
6
Rx Data
Rx Data
FIBER CABLE
(Pin assignment)
RJ-11 JACK
Signal &
Frame
Ground
Signal &
Frame
Ground
1
2
3
4
5
6
5V DC
8 ma DC
0V or 5V DC
TTL logic signal
TC8116 with Dry Contact Closure Detector
2
4
3
5
transmitter
transmitter
RJ-11 JACK
(dry contact closure)
RJ-11 JACK
FIBER CABLE
receiver
receiver
8.2ma
2
4
3
5
8.2ma
TC8116
TC8116
