DC1786A

DC1786A is a demonstration circuit 1786A showcases the LTC2871 RS232/RS485 multiprotocol transceiver with integrated termination. Separate supply inputs power the interface and logic sections, permitting operation of the logic control and I/O down to 1.7V. LEDs indicate when supplies are present. All control pins are accessible via a turret for external connections, or they may be set by jumpers. All logic I/O and interface I/O lines are routed to turrets. The RS485 interface lines are also available at a terminal block for convenient connection of a transmission line. Because the LTC2871 contains half-/full-duplex switching control it is unnecessary to jumper A and B to Y and Z for half-duplex operation.

• Bananas and turrets for supply connections along the upper edge of the board
• Turrets for logic I/O along the left edge of the board
• Turrets for RS232 and RS485 interface connections along the right edge of the board
• A terminal block, J5, for RS485 connections
• Turrets and jumpers for selecting modes along bottom edge of board
• Green LEDs to indicated the presence of VCC and VL
• 10K pull-up resistors on DI, DIN1/2 to assert a known logic-1 state when these turrets are left open