How to find Tx Rx and Gnd serial pinout for routers using multimeter
52.5 هزار بار بازدید -
8 سال پیش
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Check the table of hardware
Check the table of hardware toh for your router and if you don't find serial pinout there try looking for a populated or unpopulated 4-pin header, which can be far from the SoC (signals are relatively slow) and usually with tracks on the top or bottom layer of the PCB, and connected to the TX and RX.
Once found, you can easily check where is the GND, which is connected to the same ground layer than the power connector. The VCC should be fixed at 3.3V and connected to the supply layer ; the TX is also at 3.3V level, but using a multimeter as an ohm-meter, if you find an infinite resistance between the TX and VCC pins, it means they're distinct signals (else, you'll need to find the correct TX or VCC pin). The RX and GND are by default at 0V, so you can check them using the same technique.
Finding an UART on a router is fairly easy since it only needs 3 signals (without modem signaling) to work: GND, TX and RX (often accompanied by VCC). Since your router is very likely to have its I/O pins working at 3.3V (TTL level voltage), you'll need usb.to.rs232.ttl.converter.module or a level shifter such as a Maxim MAX232 to change the level from 3.3V to your computer level which is usually at 12V.
In order to interact with your device over its serial port, you need a minimum of three wires connected: a ground (GND); transmit (TX); and receive (RX). It is possible to get useful information about what is happening with only GND and RX, but in order to fix a problem you will usually also need TX. Your computer's TX should be connected to the device's RX, and your computer's RX should be connected to the device's TX. The computer's GND should connect the the device's GND. That way, what you say will get heard by the device and what the device says will get heard by your computer. This is often called a "null-modem" configuration.
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Once found, you can easily check where is the GND, which is connected to the same ground layer than the power connector. The VCC should be fixed at 3.3V and connected to the supply layer ; the TX is also at 3.3V level, but using a multimeter as an ohm-meter, if you find an infinite resistance between the TX and VCC pins, it means they're distinct signals (else, you'll need to find the correct TX or VCC pin). The RX and GND are by default at 0V, so you can check them using the same technique.
Finding an UART on a router is fairly easy since it only needs 3 signals (without modem signaling) to work: GND, TX and RX (often accompanied by VCC). Since your router is very likely to have its I/O pins working at 3.3V (TTL level voltage), you'll need usb.to.rs232.ttl.converter.module or a level shifter such as a Maxim MAX232 to change the level from 3.3V to your computer level which is usually at 12V.
In order to interact with your device over its serial port, you need a minimum of three wires connected: a ground (GND); transmit (TX); and receive (RX). It is possible to get useful information about what is happening with only GND and RX, but in order to fix a problem you will usually also need TX. Your computer's TX should be connected to the device's RX, and your computer's RX should be connected to the device's TX. The computer's GND should connect the the device's GND. That way, what you say will get heard by the device and what the device says will get heard by your computer. This is often called a "null-modem" configuration.
Please subscribe and find how to do #WiFiMarketing DIY Wi-Fi router long range antenna, RAM, flash and turn on social WiFi marketing with OpenWrt captive portal to boost your business using wireless LAN
High gain 9 dBi dual band wifi antenna VS original TP-LINK routers High gain 9 dBi dual band wifi antenn...
WiFi antenna hack 5dBi to 16dBi long range outdoor TP-Link router WiFi antenna hack 5dBi to 16dBi long ...
Display wirelessly to TV using AnyCast M2 Plus Mini Wi-Fi Display Dongle Receiver Display wirelessly to TV using AnyCas...
Out door long range WiFi router mod Tp-Link TL-WR841N hack lightning protection Out door long range WiFi router mod T...
Copy eprom flash chip to chip without computer ezp2010 copy tools Copy eprom flash chip to chip without...
#WiFiRouter #AntennaWiFi #DIYWiFi #OpenWRT #WirelessLAN
8 سال پیش
در تاریخ 1395/02/18 منتشر شده
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