Inova ICP-PII user manual CompactPCI, A1.8 COM1 Interface

Appendix A IPB-FPE8

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A1.8 COM1 Interface

The COM1 port features a complete set of handshaking and modem control signals, maskable interrupt generation and high-speed data transfer rates. A front-panel with COM1, mouse and keyboard interfaces is either integrated into an 8HP standard CPU front-panel or available as a separate 4HP unit. The piggyback located behind these interfaces connects to the CPU-mounted J11 connector.

Figure A1.8 COM1 Interface Pinout

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CompactPCI

Table A1.8 COM1 Connector Signals

Pin No.	Signal
	RS232	RS485
1	DCD
2	RxD	RxD, TxD +
3	TxD	RxD, TxD -
4	DTR
5	GND
6	DSR
7	RTS
8	CTS
9	RI

Note:

The standard CPU configuration has COM1 set for RS232 communication.

However, this device can be configured to

observe a two-wire, non galvanically separated, RS485 protocol. The data direction is governed by controlling the UART’s RTS signal. Writing a hex value of 0B to this register allows data to be transmitted. Writing 1B to this register configures the device to receive data.

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CPUAppendix-A ©2001 Inova Computers GmbH PageA-7