RS232 signal
RS232 signal
(OP)
Hi,
Sorry if this is obvious but I'm new to this.
I have a Moxa's NPort W2004 wireless device server connecting serial ports to our network.
The software monitoring the port can recognize inputs on the DSR pin (we are not currently using this pin)
The server describes the interface as: "RS-232/422/485, with 15 KV ESD for all signals"
The machine with the serial port has a 24 volt DC light that I would like to monitor.
Can I connect this 24 volt line directly to the DSR pin on the MOXA device server, or will I have to isolate, and or modify this signal?
Thanks for any advice,
Dan
Sorry if this is obvious but I'm new to this.
I have a Moxa's NPort W2004 wireless device server connecting serial ports to our network.
The software monitoring the port can recognize inputs on the DSR pin (we are not currently using this pin)
The server describes the interface as: "RS-232/422/485, with 15 KV ESD for all signals"
The machine with the serial port has a 24 volt DC light that I would like to monitor.
Can I connect this 24 volt line directly to the DSR pin on the MOXA device server, or will I have to isolate, and or modify this signal?
Thanks for any advice,
Dan





RE: RS232 signal
Also, a simple series resistor probably won't work because it is not guaranteed to take the input down to zero if your 24 V opens.
Put a voltage divider there. Use 1 kohm from DSR pin to ground and connect, say, 3.3 kohm to +24 V. That will give you plenty of signal (you need at least +3 V) in active state and a good connection to GND when +24 V disappears.
Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: RS232 signal
Is this better or worse?
RE: RS232 signal
Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: RS232 signal
RE: RS232 signal
Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...