RS232 and GPIO Connector: Difference between revisions
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Created page with "The RS232 port can be used to feed the SOUND4 device with UECP commands. Only the RXD/TXD signals are used for UECP, there is no handshaking : the CTS/RTS are not used == Con..." |
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The RS232 port can be used to feed the SOUND4 device with UECP commands. | The RS232 port can be used to feed the SOUND4 device with RDS UECP commands. | ||
Only the RXD/TXD signals are used for UECP, there is no handshaking : the CTS/RTS are not used | Only the RXD/TXD signals are used for UECP, there is no handshaking : the CTS/RTS are not used | ||
== Connector == | ==Connector== | ||
[[File:DB25.png|thumb]] | [[File:DB25.png|thumb]] | ||
The DB25-M GPIO+RS232 is compatible with the V.24 standard, "DTE" side, meaning that it's the same as a computer-side connector. | The DB25-M GPIO+RS232 is compatible with the V.24 standard, "DTE" side, meaning that it's the same as a computer-side connector. | ||
Consequently when connecting a computer to the SOUND4 device, you have to use a Null Modem (cross cable). | Consequently when connecting a computer to the SOUND4 device, you have to use a Null Modem (cross cable). | ||
So if your PC COM is male SUBD-9, the connection must be at minimum : | So if your PC COM is male SUBD-9, the connection must be at minimum : | ||
* PC COM DB9M TXD (pin 3) must go to (pin 3) DB25M RS_RXD | *PC COM DB9M TXD (pin 3) must go to (pin 3) DB25M RS_RXD | ||
* PC COM DB9M RXD (pin 2) must go to (pin 2) DB25M RS_TXD | *PC COM DB9M RXD (pin 2) must go to (pin 2) DB25M RS_TXD | ||
* PC COM DB9M GND (pin 5) must go to (pin 1) DB25M GND | *PC COM DB9M GND (pin 5) must go to (pin 1) DB25M GND | ||
(see [https://en.wikipedia.org/wiki/Null_modem Null_modem wiring diagram]) | (see [https://en.wikipedia.org/wiki/Null_modem Null_modem wiring diagram]) | ||
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'''Notes :''' | '''Notes :''' | ||
* the RS232 output voltage is approx. ±6V. Full ±12V is accepted at input. | |||
* the output RS_TXD pin is not active (so is 0V instead of +6V) until there is activity on RS_RXD pin. | *the RS232 output voltage is approx. ±6V. Full ±12V is accepted at input. | ||
*the output RS_TXD pin is not active (so is 0V instead of +6V) until there is activity on RS_RXD pin. | |||
Revision as of 09:55, 22 April 2020
The RS232 port can be used to feed the SOUND4 device with RDS UECP commands.
Only the RXD/TXD signals are used for UECP, there is no handshaking : the CTS/RTS are not used
Connector
The DB25-M GPIO+RS232 is compatible with the V.24 standard, "DTE" side, meaning that it's the same as a computer-side connector.
Consequently when connecting a computer to the SOUND4 device, you have to use a Null Modem (cross cable).
So if your PC COM is male SUBD-9, the connection must be at minimum :
- PC COM DB9M TXD (pin 3) must go to (pin 3) DB25M RS_RXD
- PC COM DB9M RXD (pin 2) must go to (pin 2) DB25M RS_TXD
- PC COM DB9M GND (pin 5) must go to (pin 1) DB25M GND
(see Null_modem wiring diagram)
(Optionally other V24 signals can be connected (CTS, RTS, CD, DSR, DTR) so a fully wired branded Null-Modem cable or adapter should work)
Notes :
- the RS232 output voltage is approx. ±6V. Full ±12V is accepted at input.
- the output RS_TXD pin is not active (so is 0V instead of +6V) until there is activity on RS_RXD pin.
