USB-TO-TTL-Serial

Product Introduction

Overview

This USB-to-ttl-serial module is based on CP2104, powered via MicroUSB, features a 3-pin header output, onboard three LEDs for status indication, and measures just 25×15.5mm.

Shipping List

Specifications

	Parameter
Size	25x15.5mm
Chip	CP2104
LED	Power LED, TX LED, RX LED
USB Type	MicroUSB
Pin Header	2.54mm 3PIN

Usage

Hardware Connection

CPU	Board
PX30	AIO-PX30-JD4
RK3128	Firefly-RK3128, AIO-3128C
RK3288	Firefly-RK3288, AIO-3288C, AIO-3288J
RK3308	ROC-RK3308-CC, ROC-RK3308B-CC V0.1, ROC-RK3308B-CC V1.0 ROC-RK3308B-CC-PLUS
RK3328	ROC-RK3328-CC, ROC-RK3328-PC, AIO-RK3328-JD4
RK3399	AIO-3399C, AIO-3399J, AIO-3399JD4 ROC-RK3399-PC-PLUS, ROC-RK3399-PC, ROC-RK3399-PC-Pro Firefly-RK3399, Face-RK3399 V1, Face-RK3399 V2
RK3399Pro	AIO-3399ProC, AIO-3399Pro-JD4
RK3566	AIO-3566JD4, ROC-RK3566-PC
RK3568	AIO-3568J, ROC-RK3568-PC, ROC-RK3568-PC SE
RV1106	CT36L
RV1126_RV1109	AIO-1126B-JD4,AIO-1126-JD4, AIO-1109-JD4, [CAM-C1126S2U](../../AI Camera/CAM-C1126S2U/quick_usage.md#serial-port-debugging), [CAM-C1109S2U](../../AI Camera/CAM-C1109S2U/quick_usage.md#serial-port-debugging)
RK3588	AIO-3588SJD4 AI,AIO-3588JD4,ITX-3588J,ROC-RK3588S-PC,AIO-3588SJD4,ROC-RK3588-PC,AIO-3588Q,AIO-3588SG,AIO-3588L,ROC-RK3588-RT
RK3576	ROC-3576-PC, CAM-3576Q38, AIO-3576Q, AIO-3576JD4,AIO-3576C
RK3506	ROC-RK3506B-CC,ROC-RK3506J-CC

Note: If you encounter the problem that TX and RX cannot input and output when using other serial adapters, you can try to exchange TX and RX connections.

Serial Parameters

Baud rate: 1500000
Data bit: 8
Stop bit: 1
Parity check: none
Flow control: none

Note： Boards in the following chart use the different debug baudrate, which is 115200

Model
RK3128 Series, RK3288 Series, AIO-3576JD4

Use Serial on Windows

Install Driver

Our usb-to-ttl module is using CP2104, so download driver here:

CP210X

If you bought the module using the CH340 or PL2303 from elsewhere, you can download drivers here:

CH340
PL2303

After the adapter is inserted, the system will prompt for the discovery of new hardware and initialization, and then the corresponding COM port can be found in the device manager:

Install Software

Putty or SecureCRT is generally used on Windows. Among them, we recommend using the free version of MobaXterm. This is a powerful terminal software. Here we will introduce how to use MobaXterm.

Download MobaXterm：

Select session to Serial.
Modify Serial port to the COM port found in the device manager.
Set Speed (bsp) to 1500000.
Click OK button.

Use Serial Debug on Ubuntu

There are many options available on Ubuntu:

minicom
picocom
kermit

The following shows how to use minicom.

Install minicom

sudo apt-get install minicom

To connect the serial port line, see what the serial port device file is. The following example is /dev/ttyusb0:

$ ls /dev/ttyUSB*
/dev/ttyUSB0

Run:

$ sudo minicom
Welcome to minicom 2.7
OPTIONS: I18n
Compiled on Jan  1 2014, 17:13:19.
Port /dev/ttyUSB0, 15:57:00
Press CTRL-A Z for help on special keys

Based on the above tips: Press Ctrl-a and then press Z again to bring up the help menu.

+--------------------------------------------------------------------+
                        Minicom Command Summary                      |
|                                                                    |
|              Commands can be called by CTRL-A <key>                |
|                                                                    |
|               Main Functions                  Other Functions      |
|                                                                    |
| Dialing directory..D  run script (Go)....G | Clear Screen.......C  |
| Send files.........S  Receive files......R | cOnfigure Minicom..O  |
| comm Parameters....P  Add linefeed.......A | Suspend minicom....J  |
| Capture on/off.....L  Hangup.............H | eXit and reset.....X  |
| send break.........F  initialize Modem...M | Quit with no reset.Q  |
| Terminal settings..T  run Kermit.........K | Cursor key mode....I  |
| lineWrap on/off....W  local Echo on/off..E | Help screen........Z  |
| Paste file.........Y  Timestamp toggle...N | scroll Back........B  |
| Add Carriage Ret...U                                               |
|                                                                    |
|             Select function or press Enter for none.               |
+--------------------------------------------------------------------+

Press O to enter the setting interface, as follows:

+-----[configuration]------+
| Filenames and paths      |
| File transfer protocols  |
| Serial port setup        |
| Modem and dialing        |
| Screen and keyboard      |
| Save setup as dfl        |
| Save setup as..          |
| Exit                     |
+--------------------------+

Move the cursor to Serial port setup, press enter to enter the Serial port setup interface, then enter the letter prompted earlier, select the corresponding option, and set it as follows:

+-----------------------------------------------------------------------+
| A -    Serial Device      : /dev/ttyUSB0                              |
| B - Lockfile Location     : /var/lock                                 |
| C -   Callin Program      :                                           |
| D -  Callout Program      :                                           |
| E -    Bps/Par/Bits       : 1500000 8N1                               |
| F - Hardware Flow Control : No                                        |
| G - Software Flow Control : No                                        |
|                                                                       |
|    Change which setting?                                              |
+-----------------------------------------------------------------------+

Note: Hardware Flow Control and Software Flow Control should be set to No, otherwise it may not be impossible to input.

After finishing the setting, go back to the previous menu and select Save setup as dfl to save as the default configuration, which will be used by default later.

Resource Download

Firefly USB to UART Module (driver)

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