cFP-2200/2210/2220
22
ni.com
COM 4 (cFP-2220 Only)
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-Position
Modular Jack Pin
RS-232 Signal
RS-485 Signal
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
