RS232 in Comp.Arch.Embedded
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I'm looking for a handheld PC running Windows (CE/Mobile) with a RS232
Or unless someone can inform me about whether a USB-to-RS232 device works on
Rumpelstiltskin - 4 years ago
I have test equipment with optically isolated RS232 ports.
Seems modern RS232 ports do not support +/-12V.
They all seem to be less than +/-8V, many only +/-5V.
Anybody know of a cheap source for +/-12V RS232 PCI serial boards?
What ever happened to 1488/1489 serial drivers?
electro - 7 years ago
i have a microcontroller which i want to interface to my PC thorugh VB
using the rs232 connection..
i wish to use the RTS/CTS as well as the DTR signal pins from the
1.RTS will be used to simply reset/start the microconotroller
application(rs232 output) through a port input pinof the mc...
Started by Unknown 4 years ago
Does anyone know of a modern GSM phone which still has an RS232
data cable available for it ? (Most have gone to USB .. I want to send
messages from my embedded device which only has a RS232 port)
Does anyone know of a way to put an rs232 ascii data stream onto an
i2c bus as a slave device.
For example, I have an i2c bus which has a master already. I need to
give this master the data which is coming from an rs232 device, the
problem is that all the rs232 to i2c converters I've seen are ...
RahulS - 7 years ago
I am using Rabbit development board which has separate ports for RS232
and Rs485. Right now i am using a single port both as RS232 as well as
The port works fine for RS232 signals but for RS485 signals, the
differential output is not proper.I think there is some problem with
Jones - 7 years ago
I have an embedded target I am trying to program (MC9S08DZ60
microcontroller) that has the SCI pins connected to a TJA1020T LIN
transceiver with single-wire output.
My question is, can I connect this single-wire LIN directly to a pin
(or pins) of the RS232 port on the back of an old DOS PC, ...
ömerkaraküçük - 5 years ago
I've an embedded system with Linux running on an ARM9 MCU and i need
to design an interface card to communicate with cards like 7816 smart
cards. I can only use USB interface of the system and i can
communicate with cards via rs232 protocol. do you have any idea to
convert USB port of this sytem...
can somebody suggest me a embedded linux module with RS232 and Ethernet
interfaces? Not much more is needed.
The RS232 interace is used to attach a GPRS modem module.
I want to use one of the following configurations:
1 - FTP server for the ethernet side, upload then ...
Don - 7 years ago
I am currently attempting to use the DMA channels in the TMS470 (arm7dtmi
core product from TI). I can't seem to get it working quite right. Here is
what I'm trying to do.
1. Set up a simple array of chars 'a', 'b' through 'e'
2. Write these
chars to the SCI port (RS232) via a memory-...
GregNash - 4 years ago
I have an idea to try and transmit live video camera data over one RS232
(either Tx or Rx) line. The problem is that I donâ€™t know how to go about
processing the camera data. If the camera data was transmitted over an i2c
bus, then this would be possible (as per
Miem - 7 years ago
I want to ask expert advise how can I create four RS232 interface on a
(I'm planning to use PIC18F6680)
miemchan at gmail . com
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...
I'm trying to use the ADuM1301 to isolate my embedded system from the
How can I extract +12V from RS232 DB9? With two diodes? But in what
Ajab - 5 years ago
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 f...
kathy - 6 years ago
Could anyone tell me where I can find free software for monitoring the
TCP/IP, USB, and RS232 data traffic?
Anyone know of a readily available commercial product which can log
RS232 data & store it on a removable flash card i.e.. SD /MMC/ XD etc.
The instrument will be writing ASCII CSV strings.
I have a cct etc for an AVR but I need to buy a few in a hurry & just
have it work....
Started by Don
8 years ago
Started by Unknown 7 years ago
I am working on a project which has a 6802 processor and standard ram
and eeprom (not decided which bands yet). I wonder If I can write
sofware for 6802 in PC and can send it with rs232 port to eeprom.
ratemonotonic - 6 years ago
Hi All ,
Does any one know an off the shelf (and cheap) development board with
3 RS232 ports?
Thanks in advance for any help.
I am working on a design that requires interfacing a PIC
microcontroller to the rs232 serial port of a PC. I am using the UART
of the PIC16F628 but I am having problems: I can not get my PC to
recognize the serial data sent by my PIC.
For testing purposes I hooked up a palm pilot to ...
Started by Unknown 8 years ago
My company makes an embedded device which normally is controlled by a
wintel host via RS232. The communication method is 8-bit binary, packet
based, with no hardware flow-control (3-wire interface).
I now have a new requirement: My device must communicate with a
bluetooth enabled wireless host...
Started by Unknown 7 years ago
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...
How popular is that old standby async/sync serial data in new embedded
I know there are lots of other technologies coming into play from ethernet
to wireless, USB, etc., but what percentage of your new designs are using
RS232 or RS485?
I still see it on almost every project. If n...
We are looking for recommendations for an 8 port rs232 embedded micro.
The CPU processing requirement is minimal.
i am dealing with a company that should develop a box for me. the box
should replace an existing box that is connected via rs232 to a pc.
now i have asked them to (instead of going to usb) make a proposal for
using ethernet instead of rs232.
upfront i described what i have in min...
I am developing a product that requires a serial port to transfer a
few bytes of data to a host pc on a repetitive basis. Currently using
115kbaud on an RS232 port on my board and that works fine. A little
slower is ok too. Some feedback has indicated that a USB port would
be an attractive al...
Nottingham - 8 years ago
Has anyone seen a device that allows older serial ports only computers to
use USB devices?
I can only find RS232 to USB adapters turning USB ports to RS232. I need
the other way around and to work on NT.
Tomás Ó hÉilidhe - 5 years ago
I've purchased one already made by "Cypress Semiconductor" but it
doesn't work. The VID is 04b4 and the PID is 5500.
Can anyone suggest a USB to RS232 adapter that does its job perfectly
100% of the time under Microsoft Windows, i.e. it trully behaves
exactly just like any other se...
Started by Unknown 5 years ago
Are there any sub 10 USD AVR or PIC uC that can do hardware PWM at the same
time as hardware RS232 ..?
The source of my question is that I suspect that same timer is used both for
bitrate generation and for PWM frequency+duty cycle.
Does somebody know if there is a chip with 8 input ports to send 1 byte
parallel and then automatically sends the byte out by USB (first choice) or
My problem is that I need 3 com-ports on my microcontroller and my processor
(zilog Z8S180) only has 2!!! I have an 1 byte ou...
Started by Niek
9 years ago
marL - 5 years ago
I'm doing some investigation regarding TRACE32 Simulator. I'll be
simulating a board with a PowerPC chip installed running in pSOS.
When using the board, I simply connect it through RS232 to my PC. To test
it, I use the Hyperterminal in Windows. But what I want is, instead of
iam currently programming MC68360 board processor SCC's to work for
Synchronous HDLC and iam taking out RS232 pin outs from the P2
I have initialized the registers and set jumpers according to the
instructions. but iam not getting the Clock signals from the TXCLK
Started by sunil
8 years ago
Since mscomm.ocx for some strange reason will pop a license block unless
you also install VB Professional (which most people don't need) I am
looking for other methods to communicate with RS232 from Excel VBA,
other than directly using the API. Lots of Google searching provided...
Started by Joerg
6 years ago
I need an eval. board preferably with 68HC11/12 that has full fledged RS232,
most importantly RTS and parity manipulations -- changing mark parity to
space parity from one byte to next. Do you know any such eval. board?
Started by QBA
9 years ago
I need RS232 to RS485 converter or USB to RS485 converter, are there vendors
out there you recommend for these converters? More specifically, RS485 I am
using is 2-wire (ground, don't need 4-wire version) at 19200 baudrate.
Started by QBA
9 years ago
Lyn - 5 years ago
I am reading in some temperature sensor data, via RS232 (actually
converted to USB via a CP2102 ), approx every hour into a Windows XP
PC. It reads fine into Windows Hyperterminal. I want to be able to
send this data out via email as it arrives. Is there any application
that can do this, free...
Started by Unknown 8 years ago
Is there any way to make the rs232 port on the 6812 to work like a half
William at MyBlueRoom - 7 years ago
If you're looking for the schematics on www.myblueroom.com Inchworm
ICD2 & Cricket Thermostat. I've had to move domains and transferring
was a royal pain.
I've not updated the site though, I want to put the PCB layout for the
ICD2 compatable (easy to build and very basic VDD 5V and VPP ~1...
We have a need for a fingerprint scanner to be connected to our controller,
running ROM-DOS, and only having RS232 connectivity available. The idea is
for staff to id themselves as part of a security protocol to initiate
The fingerprint ids to match are relativ...
Jack - 3 years ago
I'm preparing a end of production test for a board. The test will be
semi automatic, there will be a guy that push some buttons and turn
On the board I have rs232 an CAN communication.
For rs232 it's easy, I make a loopback after the tranceiver and just
check that the yte I rece...