RS232 Voltage Levels

Started by Charles Jean in comp.arch.embedded14 years ago 40 replies

I've got a datasheet for a chip that takes an RS232 serial input with a protocol of 9600,N,8,1. It indicates the voltage level at this input is...

I've got a datasheet for a chip that takes an RS232 serial input with a protocol of 9600,N,8,1. It indicates the voltage level at this input is hardware-selectable to either +/- 12V(as found from a PC serial port), and either normal or inverted TTL level(0-5V). I plan on feeding this chip a TTL level serial stream by bit-banging it rather than using a UART. I am familiar with the polarities ...


GUI interface for embedded gadgets

Started by pozz in comp.arch.embedded4 years ago 11 replies

Most of my electronics gadgets must be configured by the user. There many UI (User Interface) avaiable and each has pros and cons: - voice...

Most of my electronics gadgets must be configured by the user. There many UI (User Interface) avaiable and each has pros and cons: - voice assisted guide with a keypad - display and keypad - touch display - serial channel (RS232/RS485/USB/Ethernet) connected to a PC - ... Many time I choose to provide a simple RS232/USB port on my gadget, to keep its cost low. When the user wants to co...


rs232 to vga converter

Started by Hul Tytus in comp.arch.embedded12 years ago 8 replies

comp.arch.embedded rs232 to vga converter Due in large part to messages here and rec.crafts.metalworking about searches for various type of...

comp.arch.embedded rs232 to vga converter Due in large part to messages here and rec.crafts.metalworking about searches for various type of crt controllers I've built one & placed it on the market. It generates large letters in 8 line/20 characters per line and 6 line/12 characters per line formats. A 9 pin d-sub connector for rs-232 input and a 15 pin hd dsub connector for output to a...


PL2303 driver guide ?

Started by trungnl in comp.arch.embedded14 years ago 10 replies

I am writting a firmware to connect an embedded USB host with the Prolific PL2303 USB-RS232 chip. The PL2303 chip is used to get data from...

I am writting a firmware to connect an embedded USB host with the Prolific PL2303 USB-RS232 chip. The PL2303 chip is used to get data from some RS232-enabled devices and then transfer these data to the USB host. Now I need detailed information about PL2303's specification and operation, to develope the appropriate driver for it. I have been searching for some PL2303 driver or programming guides...


RS232 to RS485 conversion, RTS as control line.

Started by Ajab in comp.arch.embedded12 years ago 3 replies

Hi people, I am using a MAX3221 IC to convert RS232 to TTL and MAX3465 full duplex IC to convert TTL to RS485. Shorted TX+, RX+ and TX-, RX-...

Hi people, I am using a MAX3221 IC to convert RS232 to TTL and MAX3465 full duplex IC to convert TTL to RS485. Shorted TX+, RX+ and TX-, RX- for 2- wire RS485 protocol. RTS line is used for controlling enable of max3465. DE and ~RE are given to TTL RTS. But the RTS always remains high.. so for max3465 driver will be always enabled....... So how the receiver portion will work, because RTS...


16 Channel ADC + 16 RC Servo Motor + 1 RS232 + PIC microcontroller

Started by Roberto Hawkowski in comp.arch.embedded13 years ago 4 replies

Hello Everyone, I am a beginner hobbiest in embedded systems. I want to build a system which will have i. 16 channel, 16 bits ADC with...

Hello Everyone, I am a beginner hobbiest in embedded systems. I want to build a system which will have i. 16 channel, 16 bits ADC with SPI interface (it could be two 8 channel ADC) ii. 16 RC Servo motor driver (capablity of generating 1-2ms RC servo pulses with 10 bits resolution, for 16 RC servo motors) iii. 1 RS232 port to communicate with a PC iv. PIC microcontroller ...


Embedded board with 4 X RS232 + 4 x 10Bits ADC + 16 x Digital I/O

Started by Samuel Yodul in comp.arch.embedded14 years ago 1 reply

For a control application I'm looking for an embedded board and SW development environment with the following specs 4 X RS232 capable of...

For a control application I'm looking for an embedded board and SW development environment with the following specs 4 X RS232 capable of running upto 115200 Bauds 4 x 10Bits ADC 16 x general purpose digital I/O Weight < 150grams Main function of the SW application as follows Read serial data packet (SDP1) from Serial Port 1 (SP1) Read SDP2 from SP2 Read SDP3


Camera on RS232 =? Micro-USB module + WebCam

Started by Kouso Wieaka in comp.arch.embedded14 years ago 6 replies

Hi, I recently saw a Micro-USB module on Dontronics's web site (http://www.dontronics.com/micro-usb.html). Appearently it convert RS232 to...

Hi, I recently saw a Micro-USB module on Dontronics's web site (http://www.dontronics.com/micro-usb.html). Appearently it convert RS232 to USB and vice versa. Would it possible (how) to use this Micro-USB module con connect and an off-the shelf USB webcam to a micro controller such as ATMega or PIC? (I do not need high speed or high resolution images)


Integrated LCD/LED display and numeric keypad

Started by klam in comp.arch.embedded13 years ago 2 replies

Hi Folk, I'm going to build a control system. And I want to find a low cost integrated LED/LCD (with one or 2 line is enough) display...

Hi Folk, I'm going to build a control system. And I want to find a low cost integrated LED/LCD (with one or 2 line is enough) display with a numeric keypad that can connected using RS232 interface (or USB). It seems that there are many separate RS232 numeric keypad and simple LCD/LED display, but not an integrated one. Could anybody point me some if you know such product. Many thank...


High baud rate chips for RS232 protocol

Started by Mak in comp.arch.embedded14 years ago 6 replies

Hello all, I am interested in designing a custom board with serial interface and I am searching for RS232 port driver ICs which can support...

Hello all, I am interested in designing a custom board with serial interface and I am searching for RS232 port driver ICs which can support baud rates higher than 230kbps. There are many PCI or USB to serial interface options available which support bauds of upto 920kbps. I have designed a UART interface in FPGA but need higher baud rate driver ics to actaully get the performance I requ...


Processor Clock speed change abd RS232

Started by Anonymous in comp.arch.embedded13 years ago 7 replies

I am looking for a microcontroller with UART that will run at 1Mhz normally and 8Mhz when more power is available. My problem is the receive on...

I am looking for a microcontroller with UART that will run at 1Mhz normally and 8Mhz when more power is available. My problem is the receive on the RS232 when changing the processor clock speed. I think this will cause an upset in any receive characters coming in at the change over. Has any body got any ideas for a low power processor (0.5mA at 1MHz) that can change processor clock speed with...


WTD Addressable RS485 to RS232 Serial converters

Started by Joseph Goldburg in comp.arch.embedded15 years ago 1 reply

Hi All, I am looking for RS232 to RS485 serial converters. Requirements ---------------------- The converter should have a small buffer 20...

Hi All, I am looking for RS232 to RS485 serial converters. Requirements ---------------------- The converter should have a small buffer 20 bytes to 1k bytes. The converter should have an RS485 address. Thus the converter listens to the RS485 bus traffic.... if it spots it's address then a. It listens for a quite time on the RS485 bus then transmits header address and then the data...


WIFI

Started by YB in comp.arch.embedded15 years ago 1 reply

Hi, I'm looking for informations about WIFI module (OEM), with a TCP/IP protocol in "input" (RS232 if...

Hi, I'm looking for informations about WIFI module (OEM), with a TCP/IP protocol in "input" (RS232 if possible). Thanks, Yvan http://www.ybdesign.fr


Serial To Ethernet Converter

Started by QwertyBel in comp.arch.embedded13 years ago 5 replies

I need to remote RS232/RS485 signal over ethernet infrastructured network, which kind of device do you suggest me?? thanks a lot Bel

I need to remote RS232/RS485 signal over ethernet infrastructured network, which kind of device do you suggest me?? thanks a lot Bel


Isolated UART communication

Started by Rohan in comp.arch.embedded12 years ago 10 replies

Hi All, I want suggestions about making high-speed opto-isolated UART communications between 1. Microcoltroller to Microcontroller at TTL...

Hi All, I want suggestions about making high-speed opto-isolated UART communications between 1. Microcoltroller to Microcontroller at TTL Levels. 2. RS232


GSM Module.

Started by Baldor in comp.arch.embedded13 years ago 1 reply

I'm looking for a cheap GSM module with RS232 interface, without GPRS, I only need SMS. Any hints? Thanks.

I'm looking for a cheap GSM module with RS232 interface, without GPRS, I only need SMS. Any hints? Thanks.


JTAG for C8051F040

Started by Mikkel Lund in comp.arch.embedded15 years ago 1 reply

Hi I have to make/design a RS232 to the JTAG module on the C8051F040 ?C interface. But I can't seem to find any documentation on how this is...

Hi I have to make/design a RS232 to the JTAG module on the C8051F040 ?C interface. But I can't seem to find any documentation on how this is done. Can anyone help me? -- Hilsen / Best Regards Mikkel Lund www.control.auc.dk/~mmlu03


OT PC kbd redirection

Started by Martin Griffith in comp.arch.embedded12 years ago 5 replies

My PC knowledge is more or less restricted to defraging the screen and virus checking the batteries I need to feed a 8051 bit of kit with the...

My PC knowledge is more or less restricted to defraging the screen and virus checking the batteries I need to feed a 8051 bit of kit with the output from a PC keyboard, via RS232 or USB via an FTDI chip. It would be great if the user could be using something like Notepad, and still have the re direction Any recommendations? martin


Bluetooth connector

Started by Baxter in comp.arch.embedded14 years ago 6 replies

I need to write data from my product using a Bluetooth connection. There could be multiple devices connected. I will need to be able to connect...

I need to write data from my product using a Bluetooth connection. There could be multiple devices connected. I will need to be able to connect to either a PC or a Palm/PocketPC. I would expect that the BT module would act as an RS232 replacement. This will be a commercial application, but production volumes are low. -- ---------------------------------------------------------------...


Can transactions sniffer?

Started by Alexander Baranov in comp.arch.embedded14 years ago 6 replies

Hi, All. We are trying to implement atmega90CAN128. Could anybody advise a program (preferably with source ) that would sniff CAN-bus...

Hi, All. We are trying to implement atmega90CAN128. Could anybody advise a program (preferably with source ) that would sniff CAN-bus transactions and send data to e.g. RS232 port? Or advise why this my desire may be unreasonable? Thanks, Alex