8serial port interfaces, 1 connector, Jrex plus lx user's guide – Kontron JRexplus-LX User Manual
Page 22
KTD-S0001-C
Page 18
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
---