n.3 UART RS232 by using Raspberry

[rleonardi]

Hi,
I'm using Raspberry 2 B and I have to control n.3 devices by using RS232, but Pi only has one RS232 via GPIO.
Could you possibly tell me the best way to do this (possibly industrial grade)?
Thank you in advance.
Regards

[klricks]

Hi,
I'm using Raspberry 2 B and I have to control n.3 devices by using RS232, but Pi only has one RS232 via GPIO.
Could you possibly tell me the best way to do this (possibly industrial grade)?
Thank you in advance.
Regards

What are n.3 devices? Give a link
The RPi has 1 UART port which is NOT RS232. To get RS232 you must add a 3V3 TTL to RS232 adapter module of some sort.
You can add more USB to RS232 adapters when you need more than 1 port.

[saper_2]

Hi,
I'm using Raspberry 2 B and I have to control n.3 devices by using RS232, but Pi only has one RS232 via GPIO.
Could you possibly tell me the best way to do this (possibly industrial grade)?
Thank you in advance.
Regards

First'os: Pi is not for industry, it's not reliable like specially designed SBC for industrial applications, nor it have any fool-proof connectors, interfaces, chassis.
Second'os: In industrial SBC you have much more reliable memory (that can works for years) than RPi (SD card can work up to 6-15 months - depends on card)...
3rd: Pi have UART - universal asynchronous receiver transmitter , not RS232 - klricks already answered this - at frame level those ports are identical, at hardware level - they NOT. RS232 works with levels from -15V to +15V , while RPi UART works only with levels 0V to 3,3V - as klricks said, you need a voltage level translator (e.g. MAX3232 or similar).
4th: Yes, Pi have 1 UART.
5. You'd better use good quality USB-to-RS232 adapters or eth-rs232 bridges.
6. What in the hell is "n.3 devices" ?!
7. If I'm thanked in advance, I go lazy

There was not for so long ago topic about rs232/usb-rs232(serial) adapter(s)...

[edo1]

Pi is not for industry, it's not reliable like specially designed SBC for industrial applications

IMHO Pi's reliability is good enough

Second'os: In industrial SBC you have much more reliable memory (that can works for years) than RPi (SD card can work up to 6-15 months - depends on card)...

There are a lot of connectives. You could store data on some server in local network, remote server, cloud service and so on. You could connect NOR flash via SPI.
I hope SD card could work for a while in readonly mode.

[saper_2]

IMHO Pi's reliability is good enough

There are a lot of connectives. You could store data on some server in local network, remote server, cloud service and so on. You could connect NOR flash via SPI.
I hope SD card could work for a while in readonly mode.

I've been comparing Pi to industrial grade SBC - but he doesn't need to know that

True, pi can use different memories/network fs but that require more hardware and more configuration - as for me that's going under label "pain in the neck" ...

But, I shouldn't be talking because I plan myself to utilize rpi as rack cabinet controller (toggle power for net hardware (remote + watchdog), monitor temps, fans, ups, etc...) - so I just shut up, and please ignore me