Serial port

Applicable receivers: BD970

Item	Description
COM 1 RS-232 level no 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 is labeled Port 1 on the I/O board.
COM 2 TTL level 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 3.3V that powers the receiver needs to 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.
COM 3 TTL level no flow control	COM 3 is at 0-3.3 V TTL and is multiplexed with CAN. The receive line is also multiplexed with Event 2. The integrator must have a BD982 receiver configured to use the serial port in order to use this port as a serial port. The functionality cannot be multiplexed in real time. 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 needs to 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. SW4, labeled COM3 HW Xciever Selection, must be set to RS-232. There should not be anything connected to TP5, labeled Event 2.

Item

Description

COM 1 RS-232 level no 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 is labeled Port 1 on the I/O board.

COM 2 TTL level 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 3.3V that powers the receiver needs to 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.

COM 3 TTL level no flow control

COM 3 is at 0-3.3 V TTL and is multiplexed with CAN. The receive line is also multiplexed with Event 2. The integrator must have a BD982 receiver configured to use the serial port in order to use this port as a serial port.

The functionality cannot be multiplexed in real time. 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 needs to 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. SW4, labeled COM3 HW Xciever Selection, must be set to RS-232. There should not be anything connected to TP5, labeled Event 2.