Specifications
Connections and Wiring
35
NetLinx Integrated Controllers
Make sure to connect only the GND wire on the AXlink/PWR connector when using a separate
12 VDC power supply. Do not connect the PWR wire to the AXlink connector’s PWR (+)
opening.
DB9 Device Port: Connections and Wiring
FIG. 24 shows the connector pinouts for the rear RS-232/RS-422/RS-485 (DB9) Device Ports.
These ports support most standard RS-232 communication protocols for data transmission. This
figure gives a visual representation of the wiring specifications for the RS-232/422/485 Device
connectors. Refer to the rear of the unit for more detailed connector pinout information.
The table below provides information about the connector pins, signal types, and signal functions.
This table’s wiring specifications are applicable to the rear RS-232/422/485 Device Port connectors
on the: NI-4000/NI-3000 (Ports 1-7), NI-4100/NI-3100 (Ports 1-7), NI-2000 (Ports 1-3), and
NI-2100 (Ports 1-3).
When you connect an external power supply, do not connect the wire from the PWR
terminal (coming from the external device) to the PWR terminal on the Phoenix
connector attached to the Controller unit. Make sure to connect only the AXM, AXP,
and GND wires to the Controller’s Phoenix connector when using an external power
supply.
FIG. 24 RS-232/422/485 DB9 (male) connector pinouts for the rear Device Ports
RS-232/422/485 Device Port Wiring Specifications
Pin Signal Function RS-232 RS-422 RS-485
1 RX- Receive data X X (strap to pin 9)
2 RXD Receive data X
3 TXD Transmit data X
4 TX+ Transmit data X X (strap to pin 6)
5 GND Signal ground X X
6 RX+ Receive data X X (strap to pin 4)
7 RTS Request to send X
8 CTS Clear to send X
9 TX- Transmit data X X (strap to pin 1)
5
4
3
2
1
9
8
7
6
Male
DB9 Serial Port pinouts (male connector)
Pin 2: RX signal
Pin 3: TX signal
Pin 5: GND
Pin 7: RTS
Pin 8: CTS
RS-232
Pin 1: RX -
Pin 4: TX +
Pin 5: GND
Pin 6: RX +
Pin 9: TX -
RS-422
Pin 1: A (strap to 9)
Pin 4: B (strap to 6)
Pin 5: GND
Pin 6: B (strap to 4)
Pin 9: A (strap to 1)
RS-485