Help with NEC PX-50XM5A

kingpikey

I working on a system that contains an NI-3100 controller, and an NEC PX-50XM5A plasma monitor. The module I got from the AMX website ( http://amx.com/inconcert/ct/DevMdlDetails.asp?A=Sh&MdlNo=29222&MANNo=679&lk=cb2e5a9015f2460dfdd42dde1f85e103 ) is working. I've tested it with a touch panel connected to the system, and everything seems to be functioning. I can even connect to the controller via telnet and send commands manually (PULSE 41001:1:0,27) that successfully turn the TV/monitor on/off. However, I'm not getting any feedback from the monitor. I have watched the serial actvity lights for the port the NEC monitor is connected to, and the Tx light comes on when I send commands either via button press on the touch panel or manually via telnet, but the Rx light is never active. An example of the error/message I'm getting is below.

>PULSE 41001:1:0,27
Sending Pulse[41001:1:1,27]
>(0001686301) com.amx.duet.impl.nec.genericPlasma.dr1_0_0.NecGenericPlasma: No r
esponse received for last message sent.

I have tried changing the "Protocol Set" from ON to OFF on the TV itself. The AMX documentation for the NEC plasma module states:

* Please Note that these devices do support an AMX Beacon; however, it is mutually exclusive to the
RS-232 port on the device. This means that the beacon can be enabled and the RS-232 protocol disabled,
or the beacon can be disabled and the RS-232 protocol enabled. This is done via a menu setting located
under the ?Option 2? menu, called ?Protocol Set?. ?ON? means that the AMX beacon response is enabled,
?OFF? means that the RS-232 protocol is enabled.

When "Protocol Set" is set to ON, the TV does not respond to any commands (either via TP or telnet), and when set to OFF, responds to all commands perfect. I've double checked with the installers, and they've followed the 3wire RS-232 diagram listed in the module documentation.

Any help would be appreciated. (BTW, I'm really not familiar with what an "AMX Beacon" is.)

ericmedley

Generally speaking, I'd suggest you look for a bad connection from the TV to the AMX Master's serial port. re-terminate. If you're using a pre made cable, try another one.

If you're commands are getting through but not coming back, it's probably a wire problem.

Another thing you can do is hook up a computer to it and see if you're getting a response.

Auser

kingpikey wrote: »

(BTW, I'm really not familiar with what an "AMX Beacon" is.)

I can only guess that this is a "magic packet" sent out requesting that DDDP devices identify themselves.

Darkside

Couple of things perhaps worth doing.

Connect to the screen with HyperTerminal and ensure strings are indeed being received from the screen after you issue a cmd. Ideally using all site cabling.

If strings are being received, Control A Device in NSX and force an RXON to the port after the module is fully up and running - maybe it's been missed in the module.

HTH

kingpikey

Thanks for the help, I'll try those things out. One thing I will ask our installers about are the differences between the wiring diagrams / requirements from AMX and NEC.
As per the NEC documentation:

---

Serial connection

---

The communications method conforms to the RS-232C standard.

Baud rate: 9600 bps
Data length: 8 bits
Parity bit: Odd parity
Stop bits: 1 bit
Communications mode: Full duplex

The control connector is described below.

The PC CONTROL connector is a D-SUB 9-pin connector.

1
2 To TxD of PC
3 To RxD of PC
4
5 To GND of PC
6
7 To CTS of PC
8 To RTS of PC
9

AMX documentation:

The required communication settings are a baud rate of 9600, 8 data bits, 1 stop bit,
odd parity, and handshaking off. The cable for this device is FG#10-756. The wiring diagram for this
cable is as follows:
AMX NXI AMX NI DB-9 Female
1 (GND) 5 (GND) 5 (GND)
2 (RXD) 2 (RXD) 3 (TXD)
3 (TXD) 3 (TXD) 2 (RXD)

Might the absence of the RTS and CTS pins have something to do with it? Thanks again for the help.

Darkside

kingpikey wrote: »

Might the absence of the RTS and CTS pins have something to do with it? Thanks again for the help.

Very likely to be the problem if your wiring is all right.

Stick a link on the plasma screen end b/t CTS and RTS and it might be a bit more chatty

Make sure you have some traffic management code in your serial port handler though!

:cool:

a_riot42

NEC plasmas need the cts/rts wired if you want feedback. Not sure what the AMX module does since I use my own but HSON and 7, 8 wired correctly and you should be good.
Paul