|
|
|
When you want to connect more than 16 xControl LCDs to a single NION, you must consider the power requirements. Each xControl LCD requires approximately 30mA of power to operate. The NION RS-485 port can supply a maximum of 0.5A (see RS-422/485 serial port in RS-485 mode in the NION Hardware Manual). Therefore, up to 16 devices can be daisy-chained directly to the port. In order to connect additional devices, an external power supply is required.
In the example below, an RS-485 power injector is used to boost the available power for the devices in the chain. Pins 4 (power) and 5 (ground) of the cable would be used for the power connection. Pins 1-3 would be used for the data connection. See Preparing the EIA-485 cables for more information.
