Compact RS-485 Network Amplifier enables a bus length of 1,200 m. RS-485. Network Amplifier operates on a power supply rate of 230 VAC. RS-485. Network Amplifier functions with a transmission speed of 1200 BPS to 19200 BPS. Compact RS-485 Network Amplifier is ideal for any installation with various units connected to an RS-485 network and which must be monitored with an RS-232 connection.