Rs232 shield
Account cancelled 2016-03-09 18:15:42 2608 Views5 Replies Hi
I need help with the DFR RS232 Shield
I followed instructions but can't make it work
I've tried straight cable
I've tried null modem cable
I tried the recommended test sketch
LEDs for TX RX don't light up
Do I have a defective shield?
Pls help
Maybe there's a step or setting I've missed which is not a part of the Wiki
Marlou Jasmin Madrio
I need help with the DFR RS232 Shield
I followed instructions but can't make it work
I've tried straight cable
I've tried null modem cable
I tried the recommended test sketch
LEDs for TX RX don't light up
Do I have a defective shield?
Pls help
Maybe there's a step or setting I've missed which is not a part of the Wiki
Marlou Jasmin Madrio
2016-07-10 07:40:05 ...but there is another problem.
If a PC has ~4.8v between pins 5 and 7, it works fine.
But other PC has 5.11v on COM, and RS232 shield became very hot (>60c) in 10 seconds!
Is it normal?
Voltmeter shows drop to 4.99v between VCC and GND when wiring to 5.11v from COM. djdance
If a PC has ~4.8v between pins 5 and 7, it works fine.
But other PC has 5.11v on COM, and RS232 shield became very hot (>60c) in 10 seconds!
Is it normal?
Voltmeter shows drop to 4.99v between VCC and GND when wiring to 5.11v from COM.
djdance 2016-07-10 06:13:27 Okay, got it.
I wired COM pin 7 -> VCC and all works correctly now. TTL controller answered correctly. Great!
Strange what VCC is not jumped to DB9 on board. djdance
I wired COM pin 7 -> VCC and all works correctly now. TTL controller answered correctly. Great!
Strange what VCC is not jumped to DB9 on board.
djdance 2016-07-10 05:24:58 I stucked too.
I bought RS232-TTL board, plug it to RS232-USB converter pluged to windows PC.
No LED lights.
I've successfully installed drivers, PC sees COM, software can send and receive data.
But I got only garbage.
For example , send 00, immediately received C8. Or othe random. Why
Do I need to extra power the board?? Why it can not get voltage from PC's rs232? djdance
I bought RS232-TTL board, plug it to RS232-USB converter pluged to windows PC.
No LED lights.
I've successfully installed drivers, PC sees COM, software can send and receive data.
But I got only garbage.
For example , send 00, immediately received C8. Or othe random. Why
Do I need to extra power the board??
Why it can not get voltage from PC's rs232? djdance 