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COM 4 is an RS-485 serial port with a 10-position modular jack. The Serial 
VIs access COM 4 as port 3. COM 4 has 100 V

rms

 of operational isolation. 

Use an external RS-485 isolator if your application requires more isolation. 
Refer to Figure 26 and Table 2 for pin locations and signal descriptions.

Figure 26.  10-Position Modular Jack Pin Locations

Table 2.  10-Position Modular Jack Pin Descriptions 

10

DCD

GND

9

RXD

CTS+ (HSI+)

8

TXD

RTS+ (HSO+)

7

DTR

RXD+

6

GND

RXD–

5

DSR

CTS– (HSI–)

4

RTS

RTS– (HSO–)

3

CTS

TXD+

2

RI

TXD–

1

No Connect

No Connect

Pin 10

Pin 1