QT251 (16 serial ports and 4 network ports)-Global supplier

13th Floor, Building I1, Zhongjian Optics Valley Star, No. 799 Gaoxin Avenue, Donghu High tech Zone, Wuhan City

QT251 Product Specification

1、 Product Overview

QT251N is a high-performance 32-bit MPU embedded computer based on the Reduced Instruction Set (RISC) architecture. This CPU is a system level single-chip with ARM Cortex-A8 as the core, built-in NEON single instruction stream majority (SIMD) co processing, 256KBL2 cache with error correction code (ECC), and supports up to 1GHz frequency. The system provides RS485/RS232 communication, wired network communication, CAN bus, and optional wireless GPRS communication. It has the characteristics of small size, low power consumption, and high efficiency, and is suitable for power concentrators HMI、 Industrial control, gateway and other occasions.

2、 Product Features

1. Hardware characteristics

AM355xCPU：

32bit ARMCorte-A8 architecture, with a main frequency of 800MHz, 1.6MIPS/MHz, and a maximum main frequency of 1GHz

32KBI cache, 32KBD cache, NeonSIMD coprocessor

Memory:

512MbyteDDR3, 64KB dedicated RAM

FLASH：

512MbyteNANDFlash， Maximum support for 8Gbyte

Supports FLASH such as NAND, NOR, SRAM, etc

Encryption:

Support PRNG/DES/3DES/AES/SHA/HMAC encryption, up to 256 bit encryption mode

watchdog:

Built in WDT, overflow time less than 60 seconds, supports idle wake-up and power down wake-up

RTC:

High precision real-time clock with built-in power supply battery

Debugging port:

One serial port is the system console port. Baud rate: 115200, data bits: 8, stop bit: 1, checksum: none, flow control: none

RS485/RS232：

8-way independent RS485 communication, internal fully isolated protection design

8-channel RS485/RS232 time-division multiplexing communication, can be selected and used according to actual needs, with internal fully isolated protection design

B-code timing:

1 RS485 receiver, dedicated for B-code timing, automatically timing after connection

CAN：

1-channel CAN communication, built-in isolation protection design

Switching output input:

2-channel dual pole double throw relay output

2-channel switch input

Network:

4-channel 10M/100M adaptive industrial Ethernet, standard RJ45 interface

15KV TVS protection, internal fully isolated protection design

Wireless function (optional):

RF band 800/900/1800/1900MHz (optional 2/3/4G)

Optional WIFI: Can connect to AP, can also be used as AP

1 SIM card interface, 1 antenna interface

Transmission speed: reaching the standard speed for the corresponding function

SDCARD：

Built in SD/MMC card interface

power supply

Input voltage: 220V, supports AC and DC

Single machine power consumption:<12W

mechanical properties

Metal material of shell

Size: 1U

Protection level: IP63

working environment

Working temperature: -40 ℃~+85 ℃

Working humidity: 5%~95%

2. Software Features

2.1 System Characteristics

QT251N comes pre installed with a Linux operating system based on TIAM335x, version 3.2.0. Applications that meet POSIX standards or UNIX like platforms. For system specific hardware devices, the kernel provides a simple and easy-to-use driver interface that can accelerate user application development.

The software system of QT251N system is divided into three parts, namely Bootloader, Linux kernel, and

rootfs。 Bootloader is an open source project that complies with GPL terms. UBoot mainly boots the kernel and supports NFS mounting and NANDFlash startup; The Linux kernel is the bottom layer of the entire operating system, responsible for driving the entire hardware and providing various core functions required by the system; Rootfs is a method and data structure used to clarify files on a disk or partition, that is, a method of organizing files on a disk.

2.2 Environmental Configuration

The virtual machine system Ubuntu 10.04 provided by our company can be directly compiled and used. Username: Work

Password: 123456

编译命令： arm-linux-gnueabihf-gcc-ofilenamefilename. c

Compile chain: arm-linux-gnoabihf-4.7.tar.gz provided by our company

In a compilation environment not provided by our company, copy the compilation chain to the LINUX system on the PC, unzip the compilation chain, and add the bin directory in the root directory to the system's environment variables.

If decompressed to the/opt/arm Linux GNU directory, add environment variables as follows:

exportPATH=$PATH:/opt/arm-linux-gnu/bin

Download link for compilation chain:

https://pan.baidu.com/s/1nv19D1Z#list/path=%2FWORK%2FCortex -A8

2.3 Management machine login

IP：eth0：192.168.1.177eth1：192.168.2.177eth2：192.168.3.177eth3：192.168.4.177

Username: root Password: root

3、 Interface definition

1. Power interface

2. RS485 interface

Note: The 9th to 16th channels of RS485 and RS232 are multiplexed channels.

3. RS232 and CAN interfaces

Note: The 9th to 16th channels of RS232 and RS485 are multiplexed channels. The corresponding driver interface is the same, which is a time-division multiplexing channel.

4. Switching output input

Note: The relay output is a double pole double throw switch, as shown in the following figure:

5. Network interface

6. Debugging interface

Debugging port configuration: baud rate: 115200, data bits: 8, stop bit: 1, checksum: none, flow control: none

7. RS485/RS232 driver interface

The driver interface can be viewed in the/dev directory of the management machine.

4、 Driver instance

There are corresponding script files in the/program directory of the system, which can be used for some simple tests. Ensure that the port mapping in the startup.sh file is correct. The file content can be found in the appendix.

Appendix:

1. Content of startup.sh file:

#!/bin/sh

ln-sf/dev/ttyCH0/dev/ttyS1

ln-sf/dev/ttyCH1/dev/ttyS2

ln-sf/dev/ttyCH2/dev/ttyS3

ln-sf/dev/ttyCH3/dev/ttyS4

ln-sf/dev/ttyCH4/dev/ttyS5

ln-sf/dev/ttyCH5/dev/ttyS6

ln-sf/dev/ttyCH6/dev/ttyS7

ln-sf/dev/ttyCH7/dev/ttyS8

ln-sf/dev/ttyCH8/dev/ttyS9

ln-sf/dev/ttyCH9/dev/ttyS10

ln-sf/dev/ttyCH10/dev/ttyS11

ln-sf/dev/ttyCH11/dev/ttyS12

ln-sf/dev/ttyCH12/dev/ttyS13

ln-sf/dev/ttyCH13/dev/ttyS14

ln-sf/dev/ttyCH14/dev/ttyS15

ln-sf/dev/ttyCH15/dev/ttyS16

ln-sf/dev/ttyO1/dev/ttyS17

iplinksetcan0typecanbitrate100000

ifconfigcan0up

2. Serial. c file content:

#include#include

#include

#definemax_buffer_size100/*buffersize*/

/*******************************************/intfd1;

intflag_close;

intopen_serial(intk,int*fd)

{

intsfd=-1; charstr[100];

sprintf(str,"/dev/ttyS%d",k); printf("open%s/n",str);

sfd=open(str,O_RDWR|O_NOCTTY|O_NONBLOCK); if(sfd==-1){

perror(str); return-1;

}

else{

*fd=sfd; return0;

}

/********************************************************************/intmain(intargc,char*argv[])

{

time_ttNow,tOld; intport;

char

sbuf[]={"12345678901234567890123456789012345678901234567890/n"}; /*Fixed

Sent data*/

charsbufrec[256]={0};

intsfd,retv,i,ncount=0,mcount=0; structtermiosopt;

intlength=sizeof(sbuf);

/*****************************************************************

**/

if(argc<2)

{

printf("inputerro:serial<1~4>/n"); return0;

}

**/

port=atoi(argv[1]); open_serial(port,&fd1);

/*****************************************************************

printf("readyforsendingdata.../n"); tcgetattr(fd1,&opt); cfmakeraw(&opt);

/*****************************************************************

cfsetispeed(&opt,B9600); /*Set the baud rate to 9600bps */cfsetospeed (&opt, B9600);

/*****************************************************************tcsetattr(fd1,TCSANOW,&opt);

while(mcount<5)

{

retv=write(fd1,sbuf,length); /*Send data */if (retv==-1){

//perror("write"); printf("writeerror/n");

}

else{

printf("thenumberofcharsentis%d/n",retv);

}

ncount=0;

printf("readyforreceivingdata.../n");

time(&tOld); tNow=tOld; ncount=0;

While ((tNow-tOld)<2)/* Set receive timeout*/

{

time(&tNow); retv=read(fd2,&sbufrec[0],1); if(retv==-1){

//perror("read");

//printf("errorread/n");

//printf("tOld=%d;tNow=%d/n",tOld,tNow);

}

else{

printf("%02x",sbufrec[0]); ncount+=1;

}

mcount+=1; printf("/n");

}

flag_close=close(fd1);

If (flag_close==-1)/* Close port */printf ("ClosetheDevice1mailur!/n");

return0;

}