LD-34 Serial line switch … Line switch for four RS-232 channels … Selection of the output channel through RTS or an external digital signal … Galvanic isolation … Code independent/transparent … Withstands environments exposed to high levels of interference … AC-/DC-supply … Reliable performance and function Field of application 164 Serial switch LD-34 is a 4-channel line switch for devices with an RS-232 interface. The device has one input channel that can be connected to each one of the four other channels or all simultaneously. Selection of the output channel is made by external digital signals or through activation of the RTS signal from the connected device. There is also an expansion channel that allows the interconnection of several LD-34s. Transfer rates of up to 115.2 kbit/s are possible on each channel. LD-34 is intended for mounting on a 35 mm DIN-rail, where the modem is attached and locked in a single action. www.westermo.com

Application GND CTS RTS RD TD GND CH 3 CTS RTS CH 2 RD TD LD-34 GND CTS R+ PWR RCH2 RD TD CH3 CH 1 CH 4 RTS T+ T- GND CH4 CTS CH 5 RTS CH5 RD TD TD RD GND CTS RD CH 6 RTS RTS CTS TD DIGITA L IN AO AI EN EI COM POWER N L Also see application on page 60 Interface RS-232 Up to 115.2 kbit/s DIP-switches Accessible under lid LED indicators GND CTS RTS RD TD GND CH 3 CTS RTS CH 2 RD TD LD-34 Not used GND CTS PWR RCH2 RD TD CH3 CH 1 RTS CH 4 RS-232 Up to 115.2 kbit/s R+ T+ T- GND CH4 RS-232 Common communication port CTS CH 5 RTS CH5 RD TD TD RD GND CTS RD Expansion CH 6 RTS RTS CTS TD DI AO AI GITAL...