All Questions
33
questions
1
vote
1
answer
109
views
How to connect RS-422 to 2× RS-485?
I want to connect two Arduinos via RS-422. I have 1 converter RS-422 to TTL and two RS-485 to TTL. How I can connect outputs of my converters (Y,Z,B,A on MAX490 and A,B on MAX485)?
- 11
1
vote
1
answer
260
views
How should I layout an optocoupler isolation board with separate ground references and power supplies?
I am thinking about how to layout my opto-isolation board. It is used to protect pins on an FPGA, convert signals to RS-422 and then transmit via RJ-45.
I have seen some conflicting information about ...
- 25
1
vote
1
answer
327
views
How should I choose TVS diode capacitance for my 2MHz RS-422 application?
I have been looking at which TVS diode to select for a protecting a set of RS-422 driver lines, however I am struggling to understand how to choose them based on the diode capacitance.
The signal will ...
- 25
2
votes
1
answer
177
views
How should the gas discharge tubes for RS-422/RS-485 be placed and routing on the PCB?
I adjusted the gas discharge tubes to be close to the connectors on the PCB. The RS-422 lines have a differential line impedance of 100 Ω. My concern is, aren't the lines between the connector and the ...
- 756
0
votes
0
answers
79
views
How is the 3 terminal gas discharge tube grounded for rs 422 protection?
I took over an unfinished project. Here, gas discharge protection is used for rs422 protection. 2 different grounds are used in the project. And the middle point of the gas discharge tube seems to be ...
- 756
0
votes
2
answers
507
views
Calculate RS422 signal to travel time from one side to another
I want to calculate the time take to transfer command from one uC side to another,
this is the architecture:
the Baudrate is 115200,
the number of bits is 8.
I would like to hear explain not just an ...
- 443
2
votes
1
answer
476
views
UART to RS-485 communication between two Arduinos
I'm learning how to use a MAX485 or MAX487 IC to create a half-duplex RS-85 communication between two Arduino s.
Each Arduino has an LED that turns ON/OFF by receiving a command from the other Arduino....
- 73
0
votes
2
answers
84
views
What is SN75176 receiver pin drive current?
I am poor at understanding what datasheet symbols denote. Please help me decode what might be the drive current of receiver logic pin.
Here is the link to datasheet: https://www.ti.com/lit/ds/symlink/...
- 399
1
vote
1
answer
80
views
Connecting a radio device with controller (+ power supply) [closed]
I have a min knowledge in electronics, so I am sorry if my questions are stupid for you.
I am studying how I can connect a radio device with a controller. The radio device is a transmitter/receiver or ...
- 155
0
votes
1
answer
138
views
What is the likely power consumption for the SP3070EEN RS422 Transceiver under normal operating conditions?
I am designing with the SP3070EEN.
SP3070 Datasheet
I've tried to calculate the power consumption that this IC is likely to use when transmitting under normal conditions. I ended up with ...
- 140
0
votes
0
answers
107
views
Using an Ethernet Phy and XFMR instead of RS422
We've been using a quad RS485 setup for some time. No problems.
Now we'd like to increase the speed over what we can get away with on RS485 with the micro we're using. Essentially, we've been ...
- 15
0
votes
1
answer
719
views
RS422/RS485 termination and noise immunity
Consider a RS422/RS485 receiver like the AM26LV32 or the DS26LV32. It is used to receive the signal of incremental encoders with differential outputs. Assume that those are using drivers such as the ...
- 127
0
votes
2
answers
95
views
Re : RS422 module from Aliexpress
Was planning to work on some long distance communications with RS485 / RS422 and I saw one of these boards on Aliexpress,Amazon etc..
Does anyone know what all those passive components could be?
Would ...
- 591
0
votes
4
answers
11k
views
RS422, RS485 Termination Resistors
While going through this youtube video from TI about the RS232, RS422, RS485 differences. One thing that don't understand clearly is following slide from this video.
The blue resistors that I marked ...
- 1,479
0
votes
2
answers
769
views
1-channel GPIO from industrial PC over RS232 port
I am ordering a computer based on 4x4-R1000V motherboard (Ryzen Embedded, https://www.asrockind.com/overview.asp?Model=4X4-R1000V) for an industrial application.
I need a 1-channel GPIO (0 for zero, >...
- 167