NEC RS232 Control

[PMuse]

First time poster, long time reader.

 

I'm working on installing a hanging projector at a high school. We're trying to control the projector via rs232 and have been having a great deal of problems with it. We generally install Sanyo projectors and have never had any problems with them. This is a NEC NP4100W. Has anyone had any experience controlling these with RS232s? Or any NEC projectors? I have read through their rs232 manual twice and have not been able to get their codes to work. Could anyone give me an example of what a power on/power off code for an NEC projector should look like? I'm trying to control the projector with a Nexia Biamp Red-1. Thanks for any help!

[AHYoung]

Sanyo are pretty good at not changing their codes, however nec are a bit more model specific so you cant always expect codes to work between models but as far as I know on .off etc should be fairly universal. Try the following in Hex for on 02 00 00 00 02 off 02 01 00 00 03 speed 3800 8 bit 1 stop bit no parity. you will also have to set the baud rate on the projector to match the control system.

If youve got the correct codes for your unit and its set for the correct baud rate, id suspect your control system. try plugging it into your laptop and using terminal to verify what its sending. Ive got no experience with the nexia system, but rs232 is rs232, send it right and the unit will respond. its often worth sending a couple of on commands with a 1 second pause between as that often works where one wont.

[J Pearce]

Have you got your command format correct? Line feed and/or carriage returns are often needed.

 

Have you verified that you cabling is correct and you have tx-rx and rx-tx? Some projectors need a null-modem cable with tx-rx swapped but some projectors require a pin to pin cable.

Some units echo back when spoken to, so opening a hyperterminal and watching for the replies can verify this.