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KTD-S0008-F Page 20 Serial Port Interfaces

JRexplus-DC User's Guide

8 Serial Port Interfaces

Two fully functional serial ports (COMA and COMB) provide asynchronous serial communications. COMA and

COMB support RS-232 operation modes. They are 16550 high-speed UART compatible and support 16-byte

FIFO buffers for transfer rates from 50 Baud to 115.2 kBaud. A programmable baud rate generator allows

transfer rates up to 1 MBaud.

One serial port is available as RS-232 on the JRex front panel and can be used as well as RS-422 or RS-485

interface, the second serial port COMB is available through a 10 pin header.

8.1 Connectors

COMA is available through the standard DSUB9 connector J28 (9 pins).

Header Pin Signal Name Function DSUB25

1 /DCD Data carrier detect 8

2 RXD Receive data 3

3 TXD Transmit data 2

4 /DTR Data terminal ready 20

5 GND Ground 7

6 /DSR Data set ready 6

7 /RTS Request to send 4

8 /CTS Clear to send 5

9 /RI Ring indicator 22

The same

connector J28 can be used as a RS-422 or RS-485 interface. The configuration is changeable in

the BIOS Setup.

Header Pin RS-422 RS-485 Function

1 TX- TX- / RX- Transmit data - / Receive data -

2 N.C. N.C. Not connected

3 TX+ TX+ / RX+ Transmit data + / Receive data +

4 N.C. N.C. Not connected

5 GND GND Ground

6 RX+ N.C. Receive data + / Not connected

7 N.C. N.C. Not connected

8 RX- N.C. Receive data - / Not connected

9 N.C. N.C. Not connected

Attention: A RS-422/RS-485 terminating resistor is not equipped on the JRexplus-DC.

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