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8serial port interfaces, 1 connector, Jrex plus lx user's guide – Kontron JRexplus-LX User Manual

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KTD-S0001-C

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Serial Port Interfaces

JRexplus LX 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 1.5 MBaud.
One serial port is available as RS-232 on the JRex front panel, the second serial port COMB can be used as
well as RS-422 or RS-485 interface.

8.1

Connector

COMA is available through the standard DSUB9 connector X9 (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

1

5

9

6

9

/RI

Ring indicator

22


COMB is available through the connector X10 (10 pins). A DSUB9 adapter cable is deliverable from KON-
TRON (KAB-DSUB9-3, part number 96061-0000-00-0).

Header

Pin

Signal Name

Function

DSUB9

1

/DCD

Data carrier detect

1

2

/DSR

Data set ready

6

3

RXD

Receive data

2

4

/RTS

Request to send

7

5

TXD

Transmit data

3

6

/CTS

Clear to send

8

7

/DTR

Data terminal ready

4

8

/RI

Ring indicator

9

9

GND

Ground

5

1

10

VCC

1)

Power +5V

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