Serial port

Applicable receivers: BD990 | BD992 | BD992-INS

Item	Description
Port 1 (with flow control)	COM 1 is already at RS-232 level and already has 8 kV contact discharge/15 kV air gap discharge ESD Protection. This port has RTS/CTS to support hardware flow control. This is labeled Port 1 on the I/O board.
Port 2 (with flow control)	COM 2 is at 0-3.3 V TTL. This port has RTS/CTS to support hardware flow control. If the integrator needs this port to be at RS-232 level, a proper transceiver powered by the same 3.3 V that powers the receiver must be added. For development using the I/O board, this COM port is already connected to an RS-232 transceiver. This is labeled Port 2 on the I/O board.
Port 3 (no flow control)	COM 3 is at 0-3.3 V TTL. If the integrator needs this port to be at RS-232 level, a proper transceiver powered by the same 3.3 V that powers the receiver must be added. For development using the I/O board, this COM port is already connected to an RS-232 transceiver. This is labeled Port 3 on the I/O board.

Item

Description

Port 1
(with flow control)

COM 1 is already at RS-232 level and already has 8 kV contact discharge/15 kV air gap discharge ESD Protection. This port has RTS/CTS to support hardware flow control. This is labeled Port 1 on the I/O board.

Port 2
(with flow control)

COM 2 is at 0-3.3 V TTL. This port has RTS/CTS to support hardware flow control. If the integrator needs this port to be at RS-232 level, a proper transceiver powered by the same 3.3 V that powers the receiver must be added.

For development using the I/O board, this COM port is already connected to an RS-232 transceiver. This is labeled Port 2 on the I/O board.

Port 3
(no flow control)

COM 3 is at 0-3.3 V TTL. If the integrator needs this port to be at RS-232 level, a proper transceiver powered by the same 3.3 V that powers the receiver must be added. For development using the I/O board, this COM port is already connected to an RS-232 transceiver. This is labeled Port 3 on the I/O board.