All Questions
Tagged with transceiver rs232
9
questions
7
votes
3
answers
2k
views
Must RS-232 devices use the same logic level?
I want to interface a microcontroller with the RS-232 COM port of my PC.
My PC uses a 75232G IC, which uses +/-12V logic levels as per some multimeter tests.
Currently I'm planning to use the ...
- 490
1
vote
3
answers
1k
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RS-485 communication with slave microcontrollers driving addressable LEDs?
I am trying to figure out how to achieve the master-slave configuration shown below.
The aim is to individually address an array of 150 mA LEDs, driven by the IS31FL3265A PWM driver. For this specific ...
- 73
0
votes
1
answer
60
views
force output on a MAX3232 RS-232 transceiver
I need to probe the output RX (DOUT1/2) nets (connected to one MCU's UART) of a MAX3232 RS232 transceiver, for this I'll use the PCB test points, but I'd also like to "force" logic levels on ...
0
votes
1
answer
189
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RS-232 to RS-485 transceiver
I'm new in communication protocols and ICs. I would like to know if it is possible to connect a RS-232 (TX, RX and GND) to a RS-485 (Vcc, A, B and GND). I only need a half-duplex communication. The ...
0
votes
2
answers
707
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MAX232 vs TRS202EC Line Drivers
I have used MAX232 as UART serial line driver using 5V power supply. Now I have come across TRS202 chip in a circuit. It also run with 5V power supply. Does this chip has some special difference or is ...
- 907
1
vote
2
answers
637
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Optional pump capacitor connection on RS232 line driver/receiver Chip
Why is it on RS232 line drivers/receivers such as ICL3222, MAX3222, ADM3222, etc.. the C3 capacitor can be connected either to GND or Vcc?.
There's nothing on the datasheet regarding the differences ...
- 528
0
votes
1
answer
245
views
Utilizing both TTL and RS-232 level signals from transceiver
In the past I have used Maxim's MAX213CAI part as my RS-232 transceiver with FTDI VCOM chips. In our application we utilize both, the TTL level and the RS-232 level signals, depending on which device ...
- 871
0
votes
2
answers
147
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Do you really need all of the sigals for a general RS-232 port?
I know that having TX, RX, GND, RTS, CTS are good. What about all of the others? Do devices these days even make use of the other pins (DSR, RI, DCD, DTR)? Is it safe to generally leave out these pins?...
- 841
1
vote
0
answers
578
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Using same DB9 port for RS232 and RS485 (selectable) - looking for IC
Do any of you know of any transceiver ICs that can switch between RS232 and full or half duplex RS485? I'd like to be able to select which type of communication is used with either a jumper or input ...
- 841