Hello all,
I am putting together a holiday light show using some DMX equipment. I alr eady have two USB => DMX dongles that I am trying to use to run the show, along with several pieces of DMX gear controlled by the dongles. I just p urchased 3 Lynx Express 16 channel DMX dimmers to add to the show. Unfortu nately, they don't like the output from the dongles I am using. After trou bleshooting with another hobbyist's equipment, we found the output from my dongles is about 5V - 6V PTP. The output from his dongle is 12V PTP. It a ppears the Lynx express does not like the lower voltage. Going by the desi gner's parts list, the LEs supposedly use Texas Instruments SN65176BP RS-48
5 transceivers to handle the RS-485 bus, but when I look at the devices, th ey actually have STMicroelectronics ST485BN chips installed. I'm wondering if the SN65176BP chips would have better sensitivity, and if I obtained so me of them and plugged them in if the devices would start working with the lower voltage? Does anyone know of another alternative 8 pin DIP RS-485 tr ansceiver which might work with the lower voltages?