Pin Assignments And Connection - TC Communications TC1540 User Manual

Pin Assignments and Connection

The removable terminal blocks on the TC1540 factory configured as DCE. The pin assignments for each
type of interface are illustrated below. Pins IN(-) & IN(+) are inputs and Pins OUT(-) & OUT(+) are outputs
(or input/output for 2-Wire RS-485).
User's
Device
Figure 8.
User's
Device
Tx/Rx+
RS-422/RS-485 4-Wire Termination/Connection
IN-
Tx-
Tx+
IN+
OUT-
Rx-
Rx+
OUT+
SIG
SIG
GND
GND
4-wire RS-422/RS-485 Connection/Logic Diagram
2-wire RS-485 Termination/Connection
OUT-
Tx/Rx-
OUT+
SIG
SIG
GND
GND
Figures 9, 2-wire RS-485 Connection/Logic Diagram
120 Ω
Termination
W1
Resistor
-
+
Rcv
W5
-
120 Ω
+
Termination
-
Resistor
+
Drv/Rcv
TC1540
120 Ω
To/From
W5
-
+
Termination
Resistor
Drv/Rcv
Transition
Control
TC1540
- 8 -
TC1540D User's Manual
Rev. 1.2
To/From
Fiber
Transition
Control
Fiber