USR IOT USR-K5 Quick setup guide

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USR-K5 INTEGRATION GUIDE
File Version：V1.0.1

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Content
USR-K5 INTEGRATION GUIDE.............................................................................................................................1
1. Product overview.......................................................................................................................................................3
1.1. Product introduction.....................................................................................................................................3
2. Specifications and dimensions.................................................................................................................................. 3
2.1. Electrical parameters......................................................................................................................................3
2.2. Operating temperature....................................................................................................................................3
2.3. Mechanical characteristics............................................................................................................................. 4
3. Hardware interface.................................................................................................................................................... 5
3.1 Pin description.................................................................................................................................................5
3.2 Network port operating indicator light description:....................................................................................... 6
4. The suits for development......................................................................................................................................... 7
5. Hardware reference design........................................................................................................................................8
5.1.Hardware connections are typically applied, as shown in figure 5................................................................ 8
5.2.power interface................................................................................................................................................8
5.3.UART interface............................................................................................................................................... 9
5.4.Reference to encapsulate...............................................................................................................................10
6. Contact information...............................................................................................................................................11
7. Disclaimer............................................................................................................................................................... 12

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1. Product overview
1.1. Product introduction
Usr-k5 is a new, small serial port to Ethernet module for data transmission between TCP/UDP packets and
UART interface.
This product is integrated with TCP/IP protocol stack, users can use it to easily complete the networking
function of embedded devices, save manpower, material resources and development cycle in the
development process, so that the product can be put into the market faster, enhance competitiveness
This product in volume, width is the same as the ordinary RJ45 seat, is less than twice the length of the
ordinary network port seat, has the industry leading ultra-small volume, when working at full speed current
235mA.
This product has been rigorously tested and has been successfully applied in Banks, highways, large
corporate networks, busy networks of cameras, and complex network environments such as
fiber-to-Ethernet.
2. Specifications and dimensions
2.1. Electrical parameters
Parameter name
rating value
units
minimum value
typical value
maximum
Operating voltage (dc)
3.0
3.3
3.6
V
Operating current
-
175
-
mA
Operating current
-
300
-
mA
Low input logic level
(VIL)
-0.4
-
0.7
V
Input logic level high
(VIH)
2.0
-
VDD+0.4
V
Low output logic level
(VOL)
-
-
0.40
V
Input logic level high
(VOH)
VDD-0.4V
-
-
V
2.2. Operating temperature

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Parameter name
rating value
units
minimum value
typical value
maximum
Operating temperature
-40
Normal
temperature
85
℃
Storage Temperature
-40
Normal
temperature
125
℃
2.3. Mechanical characteristics
Mechanical dimensions are shown in FIG. 2 (in mm).
Figure2 Machine dimension

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3. Hardware interface
3.1 Pin description
The usr-k5 module is in a straight insert package with 16 external pins, two of which are fixed pins and two
are metal shell base pins. The pin that is not used is NC, which can be suspended in the application. See
figure 3.
Figure3 USR-K5 Pin elevation diagram
Pin description is shown in table 3.1
Diagram3.1 USR-K5 Pin Definitions
Number
Name
Type
Description
1
NC
\
Pin dangling
2
NC
\
Pin dangling
3
CTS
O
The default TCP connection indicator, which lights up when there is a TCP
connection, can be configured as hardware flow CTS (clear to send)
4
RST
I
Module reset (apply a low-level pulse of 200ms or more to restart the module)
5
RTS
O
The default is 485 send and receive control, high level send. Configurable as
hardware flow control RTS (request to send)
6
Reload
I
The module can restore the factory Settings. In the case of module power

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failure (or reset), pull down the Reload, then power on, keep the Reload 5s
low, pull up after 5s, and restore the factory Settings successfully.
7
NC
\
Closed for now. Please hang
8
RXD
I
Serial port reception (3.3v, TTL level)
9
TXD
O
Serial port (3.3v, TTL level)
10
GND
Power
Ground (including power and signal ground)
11
VDD
Power
Power supply (external pin shall be supplied with dc 3.3v power supply)
12
NC
\
Closed for now. Please hang
13
ETH
\
Mesh shield shell pin
14
ETH
\
Mesh shield shell pin
15
Fixed leg
\
Modular fixed column
16
Fixed leg
\
Modular fixed column
3.2 Network port operating indicator light description:
Screen indicator
light
function
explain
green light
Connection status
indication
The green light is on when connecting to the network correctly.
yellow light
Data Indication
Modules have data to receive or flash when sent, including modules
receiving network broadcast packets.

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4. The suits for development
This evaluation board is the usr-kx test board used by our company to evaluate and test the super network
port series modules. Specific functions are described as follows:
Figure4 USR-Kx-EVK sketch map
function
name
description
External
interface
DC 5.5*2.1 Power socket
5VDC IN Jack
DB9RA/F
9-Pin Female header for connecting
to PC serial port
Module
USR-Kx seat ，insert K3 module
LED
Power
3.3V power led
TXD
TXD indicator light
RXD
RXD indicator light
Button
Reset
Reset
Reload
Restore factory Settings
ISP
nouse

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5. Hardware reference design
5.1.Hardware connections are typically applied, as shown in figure 5
Figure5 USR-K5 Hardware connection
<explain>：
When designing hardware connection, customers need to pay attention to:
1.RST: module reset signal, input. Active low level, with 10K resistor inside the module pulling up to 3.3v.
When the module is powered on or fails, the MCU needs to reset the module, pull it down at least 300ms and
then pull it up.
2.TXD/RXD: serial data transceiver signal. Internally connected with a pull up resistance of 10K.
5.2.power interface
Usr-k5 is powered by 3.3v, and the working current is [email protected]. Pin 11 is the power supply pin 3.3v. It
can be connected to 10UF/6V3/10% and 100nF/50V/10% bypass patch capacitor stability module. See
figure6

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Figure6 USR-K5 Power interface diagram
5.3.UART interface
UART is a serial data interface, which only supports ttl3.3v level. It can connect rs-232 chip to rs-232 level
and connect external devices. The UART interface of this module includes TXD/RXD signal line. Taking
rs-232 level as an example, the reference circuit is as
follows:
Figure7 UART Interface reference design
If you are communicating directly with MCU (3.3v level), you only need to add the TXD of the module to the
RXD of MCU, and then connect the RXD of the module to the TXD of MCU. If the MCU is 5V level, the

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conversion circuit needs to be added in the middle, as shown in the figure below:
Figure8 UART Level conversion reference design
5.4.Reference to encapsulate
In order to facilitate the customer hardware layout, the corresponding schematic diagram packaging library
and PCB packaging library. Please download the specific files from the official website
:http://www.usr.cn/Download/52.html

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6. Contact information
Jinan USR IOT Technology Limited
Web: http://www.usriot.com
Tel.: [phone]-819 Fax: [phone]-808
E-Mail: [e-mail] Skype: fredacui526
Cell/Wechat: [phone]
Network Communication Device: Serial to Ethernet, Serial to WiFi, Serial to 2G/3G/4G modem, LTE 4G Router

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7. Disclaimer
This document provides information about usr-k5 and does not grant any intellectual property rights
license, express or implied, or by prohibition or otherwise. We accept no liability other than those stated
in the terms and conditions of sale of our products. And we make no warranty, express or implied, with
respect to the sale and/or use of the products, including fitness for a particular purpose, merchantability
or liability for infringement of any patent, copyright or other intellectual property rights. The specifications
and descriptions may be modified from time to time without prior notice.

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Update History
2020-03-06 Version V1.0.1 is established.