COM

Device Node

ES2 & MP (JetPack 6.x)

We have designed 2x 3-wire RS232 + 1x isolated RS485 inside a DB9. From the software perspective:

• COM1, RS232, maps to /dev/ttyTHS2

• COM2, RS232, maps to /dev/ttyTHS0

• COM3, Isolated RS485, maps to /dev/ttyTHS1

  • For RS485, please refer to the [4-Pin DIP Switch] section to config RS485 termination is needed.

ES2 & MP (JetPack 5.x)

We have designed 2x 3-wire RS232 + 1x isolated RS485 inside a DB9. From the software perspective:

• COM1, RS232, maps to /dev/ttyTHS3

• COM2, RS232, maps to /dev/ttyTHS0

• COM3, Isolated RS485, maps to /dev/ttyTHS1

ES1

We have designed 2x 3-wire RS232 + 1x isolated RS485 inside a DB9. From the software perspective:

• COM1, RS232, maps to /dev/ttyTHS1

• COM2, RS232, maps to /dev/ttyTHS0

• COM3, Isolated RS485, maps to /dev/ttyAMA0

Using DB9 Directly

Pin Out (NRU-220S Panel)	COM1	COM2	COM3
1
2	RX
3	TX
4		TX
5	GND	GND
6		RX
7			DATA-
8			DATA+
9

[EOL] Using the 1-to-3 Y-Cable from Neousys

The old 1-to-3 Y-cable currently is no longer available (393-D1131150-034)

The pin out is as follows.

Pin Out (Each Splitter)	Splitter A (COM1)	Splitter B (COM2)	Splitter C (COM3)
1
2	RX	RX	DATA+
3	TX	TX	DATA-
4
5	GND	GND
6
7
8
9

Disable Flow Control

We don't use the flow control of Jetson. Please disable hardware and software flow control.