Appendix A

IPB-FPE8

 

 

®

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

15

6 9

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.

A

CPUAppendix-A

©2001 Inova Computers GmbH

PageA-7

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