Chapter 3 Feature Descriptions
cFP-20xx and cFP-BP-x User Manual 3-8 ni.com
COM 3 (cFP-2020 Only)
COM 3 is an RS-232 DTE serial port with a 10-position modular jack. The
Serial Port VIs access COM 3 as port 2. Refer to Figure 3-3 and Table 3-3
for pin locations and signal descriptions.
COM 4 (cFP-2020 Only)
COM 4 is an RS-485 serial port with a 10-position modular jack. The Serial
Port 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 3-3 and Table 3-3 for pin locations and signal
descriptions.
Figure 3-3. 10-Position Modular Jack Pin Locations
Table 3-3. 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 10Pin 1
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