OnCell G2111/G2151I Series
Getting Started
2-7
Connecting a Serial Device
The RS-232 serial interface come with 15 kV ESD serial line protection and matches the pinouts of a standard
D-shell connector. A serial device or PC COM port can be connected with a DB9(M) to DB9(F) serial cable, such
as Moxa’s CBL-F9M9-150 (100 cm) or CBL-F9M9-20 (20 cm).
For OnCell G2151I Only
A separate 5-pin terminal block connector on the bottom panel is used for RS-422, 2-wire RS-485, and 4-wire
RS-485 connections. A built-
in 120 Ω terminal resistor can be activated by DIP switch if required. Pull high/low
resistor adjustments are also allowed. Both the RS-232 and RS-422/485 interfaces come with two types of
protection: (1) 2.5 kV RMS isolation for 1 min and (2) 15 kV ESD serial line protection.
RS-422/485 settings are configured by DIP switch, on the bottom panel.
•
Switches 1, 2, and 3 select the serial interface.
•
Switch 4 enables or disables the termination resistor.
•
Switches 5 and 6 set the pull high/low resistor.
Serial Interface
SW1
SW2
SW3
RS-232
ON
OFF
OFF
RS-422
OFF
OFF
OFF
4W RS-485
OFF
ON
OFF
2W RS-485
OFF
ON
ON
Termination Resistor
SW4
Enabled
ON
Disabled
OFF
Pull High/Low Resistor
SW5
SW6
1 KΩ
ON
ON
150 KΩ
OFF
OFF
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