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Appendix B

B1.8 COM1 & COM 2 Interfaces

The two COM ports feature a complete set of handshaking and modem control signals, maskable

interrupt generation and high-speed data transfer rates. A front-panel with COM1, COM2, mouse

and keyboard interfaces is either integrated into an 8HP standard CPU front-panel or available as

a separate 4HP unit. The IDE carrier board located behind these interfaces connects to the CPU-

mounted J11 and J13 connectors.

Figure B1.8 COM1 & COM2 Interface Pinout

Table B1.8 COM1 & COM2 Connector Signals

Note:

The standard CPU configuration has both

COM ports 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.

RS232 RS485

1 DCD

2 RxD RxD, TxD +

3 TxD RxD, TxD -

4 DTR

5 GND

6 DSR

7 RTS

8 CTS

9RI

Pin No.

Signal

1 2 ... 69 70 71 72 73 74 75 76 77 78 79 ... 93 94

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Inova High Performance CPU board ICP-PII Manual do Utilizador Página 74