Does the RFX9600 support full handshaking or is it using only pins 2-3-5?

Specifically, does it support CTS and RTS?

it only uses pins 2-3-5 i think.

Correct, If it does anything with CTS/RTS, it will only be pulling these pins high or low.

Lyndel, are you sure that pulling CTS/RTS high or low can be donne?

I needed this myself but Philips support said it is not possible.
I don’t know if the lines are physically connected (rs232 interface and at TTL level). If they are, there is still chance that it will be implemented in future firmware.

Lyndel, are you sure that pulling CTS/RTS high or low can be donne?

I needed this myself but Philips support said it is not possible.
I don’t know if the lines are physically connected (rs232 interface and at TTL level). If they are, there is still chance that it will be implemented in future firmware.

Don't forget only 3 connectors are a 9-pin connector, the 4th is a 3-pin plug. They also say in the document only 2,3 & 5 are used. Not opened the box so not sure if these are the only pins connected. I wouldn't be surprised if these were NOT connected.

I have come across only one device in my experience that wanted CTS/RTS to be wired and really used it. It is the DVDO line of video processors, and they only use it when doing a firmware load.

For those not familiar with the RS232 protocol: if a device wants to transmit, it asserts RTS (Request to Send) and waits for CTS to be asserted back. However in todays world with only pins 2, 3, 5 being used it is assumed that the receiver is always in a state to receive.

All other systems I have seen use either no handshake or a software handshake. If a system is obeying RS232 protocol, but not really doing RTS/CTS logic the following conditions may be kludged by wiring a suitable cable.


CTS (clear to send) for the device should be asserted from some other pin. DCE (Data Communications enabled) should also be asserted to the device as that controls whether the device is able to receive in strict accordance with RS232 protocol.

If there is no signal available from the extender to assert the DCE and CTS i.e. only 2,3,5 are wired, then the DTR (Data Terminal Ready) pin from the device may be tied to CTS and DCE to assert those signals. If a device wants CTS and DCE to be asserted but do not supply DTR then shame on them!!!

Pinouts and signal names for RS232 are available through a web search

I am curious - what devices what to see CTS/RTS and really use the handshaking.

In todays wrorld of high speed uarts and large buffer sizes almost all chip sets run or are capable of running full duplex.

The Yamaha RX-Z9 asserts RTS when the unit is plugged in and will not responed unless CTS is asserted

Dave

Okay on the Yamaha, but does it really handshake? If it just asserts RTS and keeps it asserted, then looping it back to CTS makes everyone happy. Many null modem cables do it that way, others do it more in accordance with the rs232 spec.

I found the Marantz VP12S2 required handshaking. I solved the problem by upgrading to a VP11S1 projector.