Chapter 3
Feature Descriptions
cFP-21xx and cFP-BP-x User Manual
3-8
ni.com
COM 2 (cFP-2110 and cFP-2120 Only)
COM 2 is an RS-232 DTE serial port with a 10-position modular jack. The
Serial Port VIs access COM 2 as port 1. Refer to Figure 3-3 and Table 3-3
for pin locations and signal descriptions.
COM 3 (cFP-2120 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-2120 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
6
DSR
7
RTS
8
CTS
9
RI
Table 3-2.
DB-9 Pin Descriptions (Continued)
DB-9 Pin
RS-232 Signal
Pin 10
Pin 1
