Pelco FR85041 installation manual RS-485, RS-232, RS-422, Wire, Bi-Phase

Table B. Data Connector Pin Assignments

				RS-485	RS-485
Pin Number		RS-232	RS-422	2-Wire	4-Wire	Manchester	Bi-Phase
	1	—	TX+ (Out+)	T+/R+ (Out+/In+)	TX+ (Out+)	—	—
	2	—	TX- (Out-)	T-/R- (Out-/In-)	TX- (Out-)	—	—
	3	—	RX+ (In+)	—	RX+ (In+)	RX+ (In+) (W)	RX+ (In+)
	4	—	RX- (In-)	—	RX- (In-)	RX- (In-) (B)	RX- (In-)
	5	RX (In)	—	—	—	—	—
	6	TX (Out)	—	—	—	—	—
	7	—	—	—	—	TX+ (Out+) (W)	TX+ (Out+)
	8	—	—	—	—	TX- (Out-) (B)	TX- (Out-)
	9	Ground	—*	—*	—*	Shield	Shield
*Ground may be required based on conditions of installation. Refer to the current version of
	EIA/TIA-422 and EIA/TIA-485 standards for additional information.
NOTES:
•	RX (In), RX+ (In+), RX- (In-), R+ (In+), and R- (In-) denote data input to the transmitter/
	receiver.
•	TX (Out), TX+ (Out+), TX- (Out-), T+ (Out+), and T- (Out-) denote data output from the
	transmitter/receiver.
•	W denotes white wire, and B denotes black wire.
•	Data ports are not terminated. For RS-422, RS-485 2-wire, RS-485 4-wire, Manchester, and
	Bi-Phase data signals, termination may be required based on conditions of installation.
	If termination is required, terminate the data signal at the endpoint of the data bus using a
	120-ohm resistor.

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