Digital Communication allows the controller to communicate with a PC or a networked computer system.
The RS232 standard allows a single instrument to be connected to a PC, a Programmable Logic Controller, or a similar devices using a cable length of less than 15m while the RS485 standard allows one or more instruments to be connected(multi-dropped) using a two wire connection, with cable length of less than 1200m. 100 Instruments and one "Host" may be connected in this way.
RS485 is recommended for plant installation.