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USR-C216
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Usr USR-C216 User Manual

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USR-C216 User Manual Technical Support: h.usriot.com

USR-C216 User Manual

File Version: V1.0.0
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Contents
USR-C216 User Manual..........................................................................................................................................1
1. Get Start...............................................................................................................................................................5
2. Product Overview................................................................................................................................................7
3. Product Function...............................................................................................................................................12
3.1. Wireless Distribution Network........................................................................................................12
3.1.1. Work as AP................................................................................................................................ 12
3.1.2. Work as STA..............................................................................................................................13
3.1.3. Work as AP+STA...................................................................................................................... 13
3.1.4. Encryption Mode...................................................................................................................... 14
3.2. Work Mode........................................................................................................................................14
3.2.1. Transparent Transmission Mode.............................................................................................14
3.2.2. AT Commands Mode................................................................................................................16
3.2.3. HTTPD Client Mode................................................................................................................ 16
3.3. UART Parameters.............................................................................................................................18
3.3.1. UART Parameters Intro...........................................................................................................18
3.3.2. Similar RFC2217.......................................................................................................................18
3.4. Extra Function.................................................................................................................................. 19
3.4.1. Search in LAN...........................................................................................................................19
3.4.2. TCP/UDP Client Register Function........................................................................................21
3.4.3. USR-Link................................................................................................................................... 21
3.4.4. Heartbeat Package....................................................................................................................22
3.4.5. Customize Webpage..................................................................................................................23
3.4.6. Wi-Fi Connection Exception Handling...................................................................................23
4. Setting Method.................................................................................................................................................. 23
4.1. Webpage Setting................................................................................................................................23
4.1.1. Open The Webpage...................................................................................................................24
4.1.2. Wi-Fi Setting..............................................................................................................................25
4.1.3. Transmission Setting.................................................................................................................26
4.1.4. Extra Function.......................................................................................................................... 27
4.1.5. Firmware Upgrade....................................................................................................................28
4.1.6. Standby Upgrade Page.............................................................................................................28
4.2. AT Command Setting....................................................................................................................... 29
4.2.1. Error Table................................................................................................................................ 30
4.3. AT Commands...................................................................................................................................30
6.Contact Us.............................................................................................................................................................. 32
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7.Disclaimer..............................................................................................................................................................32
8.Update History......................................................................................................................................................32
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Feature
Support WiFi@2.4 GHz 802.11b/g/n wireless standards
Support WEP/WPA/WPA2 security mode
Support AP, STA, AP+STA working mode
Completely integrated serial-to-wireless TCP/UDP transmission function, multiple serial rate
selection
Local area network search and wireless parameter setting function
Support TCP/UDP client registration packet mechanism
Supporting simple Config/ usrlink fast networking configuration
Support similar RFC2217 automatic baud rate adaptation function
Supporting simple AT commands
Support Httpd client function
3.3V single power supply
Selection of built-in antenna and external antenna (antenna pad)
Ultra-small size: 22.0mm x 13.5mm x 2.7mm, SMT package
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1. Get Start

This chapter is a quick introduction to the USR-C216 product. New users are advised to read this chapter
carefully and follow instructions to get a systematic understanding of the product. Users can skip this chapter if
they are familiar with such products. Refer to the subsequent chapters for specific details and instructions.

1.1. Hardware Connection

We connect the serial port and network port of the USR-C216 to PC, if PC has no serial port, you can use USB to
232cable. Hardware connection:
Figure 1 hardware connection
You just need connect RS232 cable and power to C216 as picture shows.

1.2. Net Connection

Search WIFI on PC, connect the WIFI named USR-C216
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Name
Parameters
SSID
USR-C216
Encryption mode
Open, none
Serial port
115200, 8, 1, none, nfc
Network
TCPS, 8899, 10.10.100.254
IP
10.10.100.254
Figure 2 search SSID
Set the PC DHCP mode, USR-C216 support DHCP server mode, this function is open by default.

1.3. Data Transmission Test

The default parameters:
Steps :
1\open”USR-TCP232-Test.exe”, COM11 represents the serial number of C216,set the baud rate 115200,then open the
serial port;
2\choose TCP Client mode, IP:10.10.100.254,the server port is 8899,then click connect.
The data from serial port to net is: serial port of PC->serial port of C216->C216->network port(or wifi) of C216->PC;
The data from net to serial port is: PC-> Ethernet (or wifi) of C216->C216->serial port of C216->serial port of PC
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Figure 3 data transmission test

2.Product Overview

2.1. Product Introduction

The hardware of USR-C216 is integrated into MAC, basic frequency chip and RF transceiver unit. Built-in low power
operation mechanism can effectively realize the low power operation of the module; Support Wi-Fi protocol and
TCP/IP protocol, users only need a simple configuration, to achieve the networking function of UART devices. Module
size is small, easy to solder in the customer's hardware circuit. And the module can choose the application of internal or
external antenna, convenient for customers to choose multiple.
The specific size of the module: 22.0mm x 13.5mm x 2.7mm, SMT package
The basic functions of the module are described as follows:
Module to achieve serial data to network data transmission function: including Socket transparent transmission, Httpd
Client transparent transmission.
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2.2. Electrical Parameters

Item
Index
Wireless parameters
Wireless standard
802.11 b/g/n
Transmitting power
802.11b: +19dBm(Max.@11Mbps，CCK)
802.11g: +18dBm(Max.@54Mbps，OFDM)
802.11n: +16dBm(Max.@HT20，MCS7)
Receiving sensitivity
802.11b: -85 dBm(@11Mbps，CCK)
802.11g: -70 dBm(@54Mbps，OFDM)
802.11n: -68 dBm(@HT20，MCS7)
Antenna
C216-a: antenna pad
C216-b:board-mounted ceramic antenna
Hardware parameters
Data interface
UART Working voltage
3.0~3.6V
Working current
AP: average:74mA max:285mA STA: average:32mA max:196mA (work with 3.3V power supply)
Working temperature
-20℃-85
℃
Storage temperature
-40℃-125℃
Working humidity
5~95%RH(no condensation)
Storage humidity
5~95%RH(no condensation)
Size
103*105*25mm（L*W*H
）
Encapsulation
SMT
Software parameters
Wireless network type
STA/AP/STA+AP mode
Security mechanism
WEP/WPA-PSK/WPA2-PSK
Encryption type
TKIP/AES
Network protocol
IPV4, TCP/UDP
Software function
DHCP/static IP
support
DNS
support
Web server
support
Socket
TCP Server，TCP Client，UDP Server， UDP Client
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Figure 4 basic function
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Httpd client
support
Similar RFC2217
support
Register packet
support
Setup method
AT+ command, webpage
min
suggest
max
unit
Voltage
3.0
3.3
3.6
V
Voltage ripple
--200
mV
Current
350
500
-
mA
min
average
max
unit
STA mode without AP connection
-50114
mA
STA mode connect to AP but no
data transmission
-30102
mA
STA mode connect to AP with data
transmission(10 K/s)
-67160
mA
AP mode connect to STA but no
data transmission
-69243
mA
AP mode connect to STA with data
transmission(10K/s)
-74230
mA

2.3. Power Supply and Power Consumption

2.4. Appearance Size

Unit mm
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Pin
Name
Signal type
Intro
1
GPIO1
NC
NC
2
GPIO2
NC
NC
3
GPIO3
I/O
GPIO, do not support
4
GPIO4
I/O
GPIO, do not support
5
UART0_ TX
O
TX of UART
6
UART0_ RX
I
RX of UART
7
UART0_ CTS
I
CTS of UART
Figure 5 schematic diagram of interface
Figure 6 pin of C216
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8
UART0_ RTS
O
RTS of UART
9
SPI_IRQ
O
485 Control pin, after disabled 485 function presents high resistance state, enable 485 function, the default is low level; when serial port has data transmission, temporary switch to high level
10
nReset
I
Module reset, low level effective, pull down at least 100 ms
11
nReady
O
Module works normally with indication pin, low efficiency, external LED
12
nReload
I
Pull down 0.5-3 seconds to start Simple Config distribution network. Pull down more than 3 seconds to restore factory settings.
13
nLink
O
Module Wi-Fi Connection Indicator Pin, Low Effective, External LED
14
WPS
I/O
WPS function pin, do not support
15
VCC
P
3.3V
16
GND
P
ground
17
RFIO
O
Radio Frequency Signal Output
Note: P means power, I means in, o means out, N means not support
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3.Product Function

USR-C216 User Manual Technical Support: h.usriot.com
Figure 7 function of C216

3.1. Wireless Distribution Network

The USR-C216 serial server can be configured either as a wireless STA or as an AP. So USR-C216 logically
supports two wireless interfaces, one as STA, the other as an AP, and the other STA can connect to the wireless
network through AP interface of the serial server.
Description
AP: wireless access point, which is the core node of a wireless network. The wireless router is an AP, and other
wireless terminals can be connected to each other via AP.
STA: wireless station, which is a terminal of wireless network. Such as PC , PAD, etc.

3.1.1.Work as AP

Set C216 work at AP mode. Other C216s and computers can be connected to the C216 as STA, and it can also be
connected to user equipment through RS232/RS485 interface.
Setup by AT commands:
AT+WMODE=AP
AT+WAP=11BGN,USR-C216,CH6
AT+WAKEY=WPA2PSK,AES,password
AT+RELD
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Figure 8 work as an AP

3.1.2.Work as STA

Set C216 work at STA mode and connect to other AP. The communication between STA is accomplished by AP
forwarding.
Setup by AT commands:
AT+WMODE=STA
AT+WSSSID=router-ssid
AT+WSKEY=WPA2PSK,AES,password
AT+RELD
Figure 9 work as STA

3.1.3.Work as AP+STA

USR-C216 can support one AP interface and one STA interface simultaneously. After opening the AP+STA function,
the STA and AP interfaces are available at the same time. The STA interface of the serial server is connected to the
router and is connected to the server in the network through TCPB, and the AP interface can be connected by mobile
phone / PAD (through TCPA). The TCP Server, mobile phone / PAD and so on in the network can control the serial port
devices connected by USR-C216 or set the parameters of serial port server itself.
Setup by AT commands:
AT+WMODE=APSTA
AT+WAP=11BGN,USR-C216,CH6
AT+WAKEY=WPA2PSK,AES,password
AT+WSSSID=router-ssid
AT+WSKEY=WPA2PSK,AES,password
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AT+rRELD
Figure 10 work as AP+STA
Through the AP + STA function, it is easy to use handheld devices such as mobile phone / PAD to monitor user
equipment without changing its original network settings.
Through the AP + STA function, the serial port server can be set conveniently, which solves the problem that the
serial port server can only be set through the serial port in STA.

3.1.4.Encryption Mode

Support:
WPA-PSK/TKIP
WPA-PSK/AES
WPA2-PSK/TKIP
WPA2-PSK/AES
WEP

3.2. Work Mode

C216 work mode: transparent transmission mode, HTTPD Client mode, AT command mode.

3.2.1.Transparent Transmission Mode

C216 supports the serial port transparent transmission mode, in which the data needed to be sent and received are
transparently transmitted between the serial port and WIFI, without any parsing, to achieve data transfer between
general serial port devices and network devices.
In transparent transmission mode, users can fully compatible with the original software platform. Users can basically
support wireless data transmission without software modification.
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Command
Intro
1
NETP
Set/query network protocol parameters
2
TCPTO
Set/query timeout of socket A
3
TCPLK
Query TCP connection status
4
TCPDIS
Set/query socket A auto-connection or not, or disconnect
5
SOCKB
Set/query socket B parameters
6
TCPTOB
Set/query timeout of socket B
7
TCPLKB
Query socket B status
8
TCPDISB
Set/query socket B auto-connection or not, or disconnect
9
UART
Set/query UART parameters
10
UARTTE
Set/query interval
Setup by AT commands
Webpage:
Figure 11 transparent transmission
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Figure 12 transparent transmission

3.2.2.AT Commands Mode

In AT commands mode, users can query the current state of USR-C216 or set the parameters of USR-C216 by sending
AT commands.

3.2.3.HTTPD Client Mode

Note: only firmware version 2.0.3 and later can support this function.
In this mode, the user can send data to the specified HTTP server, and the C216 automatically adds HTTP protocol
header to the data sent, the content of the specific protocol header can be set by AT instructions or web pages.
This mode is used by C216 transmit data to HTTP server or to retrieve data from HTTP server. Users are using the AT
commands or webpage to set up the specific contents of the HTTP header.
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Figure 13 http client mode
GET mode:
Figure 14 GET
POST mode:
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AT commands:
No.
Command
Intro
1
TMODE
Query/set work mode
2
HTPSV
Query/set httpd server and port
3
HTPTP
Query/set httpd request type
4
HTPHD
Query/set httpd header
5
HTPURL
Query/set httpd URL
6
HTPFT
Query/set filter header or not
7
HTPTO
Query/set time of timeout
Name
Parameters
Baud rate
1200，2400，4800，9600，14400，19200，38400，57600，115200，
128000，230400，460800
Data bit
7,8
Stop bit
1,2
Check bit
NONE
EVEN
ODD
MARK
SPACE
Flow/485
NFC
FC
485
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Figure 15 POST

3.3. UART Parameters

3.3.1.UART Parameters Intro

Setup by AT commands:
AT+UART=115200,8,1,NONE,NFC

3.3.2.Similar RFC2217

RFC2217 is a standard protocol for instantly modifying device serial port parameters through Ethernet. This
device supports a protocol similar to RFC2217, not standard RFC2217, which implements the same function, but
the protocol is simpler.
Enable by AT commands:
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AT+RFCENA=ON
The command takes effect immediately, does not need to restart, valid at this time, will not be saved, power loss.
Figure 16 similar RFC2217

3.4. Extra Function

3.4.1.Search in LAN

C216 supports search in-LAN. When C216 is connected to a wireless router, users can obtain the IP address of
the serial server in C216's current LAN by sending UDP broadcasts to a fixed port to realize device search and
communication. It can also directly connect C216's AP to send search instructions.
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Figure 17 search in LAN
Users can set the search port and search key by AT commands:
1. Search key: AT+ASWD=www.usr.cn
2. Search port: AT+SEARCH=48899
Search process:
1. On another device in the LAN, the search command "www.usr.cn" is sent via UDP broadcast (broadcast
address: xx.xx.xx.255, port: 48899).
2. When C216 receives the password, if it is correct, C216 enters configuration mode, send IP, MAC, MID to the
address, and send +ok (no return) through UDP to enter network AT instruction mode.
If the C216 doesn’t receive the setup command within 30 seconds after entering the configuration mode, it will
exit the configuration mode. The user needs to resend the search command word and enter the configuration
mode.
3. Users can set and read the parameters/states by sending network AT commands (upper case) to the port. The
net AT commands are in the same format with serial AT commands.
Note: Search tools and C216 must be in the same LAN. If multiple STAs are connected to a router, the computer
running the search tool is also connected to that router. This search tool can search all the STA.
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No.
Command
Intro
1
REGENA
Setting the type of registration package
2
DTDID
Set the register package ID
3
REGUSR
Registration package settings
4
CLOUDID
Query/setting USR-Cloud account
5
CLOUDPW
Query/setting USR-Cloud password

3.4.2.TCP/UDP Client Register Function

Figure 18 register package
This function is only applicable when C216 work at TCP/UDP Client.
There are two ways to register the MAC / USR function: one is to send the registration information when
connecting to the server for the first time, and the other is to add the registration information to the data sent
each time.
There is only one way to register a CLOUD, that is, to send a registry package to join USR-Cloud when connecting
to a server.
The relevant parameters of the function are set on the "serial port and other settings" part of the web page,
disable by default .
The relevant commands are set as follows:

3.4.3.USR-Link

When USR-C216 works in AP mode, it opens a UDP port with a port number of 48899 for receiving commands
from the Fast Networking Protocol. The mobile phone can be directly connected to the WIFI network of
USR-C216, query the list of SSID information and set the router SSID and password through the command of
UDP protocol. After setting up, USR-C216 will automatically restart and connect to the router, then work in STA
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No.
Command
Intro
1
HEARTEN
Query/set enable/disable heartbeat package
2
HEARTTP
Query/set the type of heartbeat package
3
HEARTDT
Query/set heartbeat data
4
HEARTTM
Query/set interval of heartbeat package
mode.
Figure 19 usr-link

3.4.4.Heartbeat Package

Note: only firmware version 2.1.8 and later can support this function.
In the transparent mode, users can enable the function of the custom heartbeat package. Heartbeat packets can
be sent in the following directions: NET - Network Server, COM - Serial Device.
Figure 20 heartbeat package
Setup by AT commands:
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STAAPAP+STA
heartbeat
interval
OFF
---
-
ON
Switch to AP+STA mode
-
1. AP+STA mode set manually
by users, module does not do
any operation.
2. The AP+STA mode is
automatically switched by STA
mode. The module tries to
connect the router and restores
the STA mode if the connection
succeeds.
1 min
2~240
Initialize WiFi
Initialize WiFi
Initialize WiFi
2~240 min
Parameter
Default
SSID
USR-C216
IP
10.10.100.254
Subnet mask
255.255.255.0
Account
admin
Password
admin

3.4.5.Customize Webpage

Note: only firmware version 2.0.7 and later can support this function.
Please contact sales.

3.4.6.Wi-Fi Connection Exception Handling

Note: only firmware version 2.2.2 and later can support this function.
There are three types of Wi-Fi exception states:
1. C216 can’t ping the gateway when it work as STA three consecutive times;
2. When C216 work as AP, no STA can connect to;
3. whenC216 work as AP+STA , it can’t ping gateway and no STA can connect to.
This function can be set by AT+MDCH

4.Setting Method

C216 supports AT commands and webpage setting.
C216 and PC should join the same WIFI, or set the PC join the WIFI of C216. Then users can login the webpage of
C216.

4.1. Webpage Setting

C216 default AP mode.
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4.1.1.Open The Webpage

Make PC join the WIFI of C216, enter 10.10.100.254, the account and password are both admin.
Figure 21 webpage configure
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4.1.2.Wi-Fi Setting

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Figure 21 wifi setting
Users can configure work mode , network SSID , password…etc
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4.1.3.Transmission Setting

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Figure 22 transmission setting
Users can setup baud rate, data bit…etc serial port parameters; choose work mode, and set the socket function.
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4.1.4.Extra Function

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Figure 23 extra setting
The heartbeat and register package can be set on this page.
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4.1.5.Firmware Upgrade

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Figure 24 upgrade firmware

4.1.6.Standby Upgrade Page

Enter 10.10.100.254/iweb.html
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Figure 25 upgrade firmware

4.2. AT Command Setting

Steps to switch from other modes to command mode:
1. send +++ from serial port to module, when module receive +++, it will return “a”;
2. after serial port receive a ,send another “a” to module,module will return”+OK”when
reveive,then enter AT command mode.
Users can send”+++a ”,when module return”+OK”,it work at AT command mode.
Illustration:
Send +++ and “a” need finish in time:
Requirement:
T1> packing interval
T2,T3<=300ms
T5<=3s
You can switch from command mode to transparent mode when you enter AT+ENTM and “enter key” in
command mode.
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4.2.1.Error Table

Error code
Intro
-1
Invalid command format
-2
Invalid command
-3
Invalid operate code
-4
Invalid parameters
-5
Operation not permitted
Command
Function
E
Open/close instruction recall
WKMOD
Query / setup work mode
ENTM
Exit command mode
MID
Query module ID
RELD
Restore factory settings
Z
Reboot module
VER
Query software version
CFGTF
Copy user configuration parameters to factory configuration settings
UART
Query/setup the parameter of serial port
UARTTE
Set/query the interval of every two bytes
NETP
Query/setup the parameter of net protocol
TCPTO
Set/query timeout of socket A
TCPLK
Query TCP connection status
TCPDIS
Set/query socket A auto-connection or not, or disconnect
SOCKB
Set/query socket B parameters
TCPTOB
Set/query timeout of socket B
TCPLKB
Query socket B status
TCPDISB
Set/query socket B auto-connection or not, or disconnect
WSKEY
Set / query encryption parameters in WIFI STA mode
WSSSID
Set / query AP SSID in WIFI STA mode
WANN
Setting / querying WAN settings is valid only in STA mode.
WSMAC
Query MAC of STA
WSLK
Query wireless connection status of STA
WSLQ
Query wireless signal intensity of STA
WSCAN
Search AP
WSDNS
Query/set DNS server address in static configure when C216 work as
STA
LANN
Setting / querying LAN settings is valid only in AP mode.
WAP
Setting / querying parameters in WIFI AP mode

4.3. AT Commands

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WAKEY
Set / query encryption parameters in WIFI AP mode
WALK
Query the MAC of STA which connect to C216
TMODE
Set / query data transfer mode (transparent transport mode or protocol
mode)
HTPSV
Set / query server address and IP (HTTPD Client)
HTPTP
Set / query HTTP request type
HTPHD
Set / query HTTP header (HTTPD Client)
HTPURL
Set / query URL (HTTPD Client)
HTPFT
Filter the header or not
HTPTO
Query/set http request timeout time
PLANG
Set/query the language of webpage
WEBU
Set / query landing parameters for WEB pages
DTDDIS
Enable/disable D2D function
DTDID
Set/query D2D ID
CLOUDEN
Enable/disable USR-Cloud
CLOUDID
Query/set cloud ID
CLOUDPW
Query/set cloud password
REGDIS
Enable/disable customize register packet
REGUSR
Query/set the content of register package
REGENA
Query/set register packet
DTTY
Query/set register packet mechanism
PING
Network ping command
WRMID
Set the ID of C216
SEARCH
Set/query C216 search port
ASWD
Set/query C216 search key
USERVER
Query custom version number
RPTMAC
Query report MAC function open or not
WRRPTMAC
Set the report MAC function
NTPEN
Enable/disable NTP network clock
NTPTM
Query the time of network clock
NTPSER
Query/set NTP server and time zone
NTPRF
Query/set interval of NTP calibration time
WAPM
Set display the MAC suffix or not
HEARTEN
Query/set enable/disable heartbeat packet function
HEARTTP
Query/set the send type of heartbeat packet
HEARTDT
Query/set heartbeat packet data
HEARTTM
Query/set the interval of sending heartbeat packet
MDCH
Query/set Wi-Fi exception handling status
USR-C216 User Manual Technical Support: h.usriot.com
Jinan USR IOT Technology Limited www.usriot.com
32
Edition
Describe
V1.0.0
2019-3-13 establish

6.Contact Us

Company: Jinan USR IOT Technology Limited
Address: Floor 11, Building 1, No. 1166 Xinluo Street, Gaoxin District, Jinan, Shandong, 250101, China
Web: www.usriot.com
Support: h.usriot.com
Email: sales@usr.cn
Tel: 86-531-88826739/86-531-55507297

7.Disclaimer

This document provide the information of USR-C216 products, it hasn’t been granted any intellectual property
license by forbidding speak or other ways either explicitly or implicitly. Except the duty declared in sales terms
and conditions, we don’t take any other responsibilities. We don’t warrant the products sales and use explicitly
or implicitly, including particular purpose merchantability and marketability, the tort liability of any other patent
right, copyright, intellectual property right. We may modify specification and description at any time without
prior notice.

8.Update History

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