Table 3. USB 2.0 Port Pin Descriptions
Pin
Signal Name
Signal Description
1
VBUS
Cable Power (+5 VDC)
2
D-
USB Data -
3
D+
USB Data +
4
GND
Ground for power return
RS-485/422/232 Serial Port
The IC-3121 has a single serial port that can operate in either RS-485/422 mode or RS-232
mode. Set the serial port mode in the BIOS setup utility.
The serial port is a 10-position RJ50 modular jack, which can connect to serial devices, such
as PLCs, scanners, and lighting devices.
NI recommends the following serial cables for the IC-3121.
Cable
Part Number
RJ50 10-position modular plug to DB-9 serial cable
182845-01 for 1 meter cable
182845-02 for 2 meter cable
182845-03 for 3 meter cable
Figure 6. RS-485/422/232 Serial Port Pin Locations
3
4
5
6
7
8
9
10
1
2
Table 4. RS-485/422/232 Serial Port Pin Descriptions
Pin
RS-485/422 Mode
RS-232 Mode
1
No Connect
No Connect
2
TXD-
Unused
6
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IC-3121 User Manual