17
3.11 Serial Port Connectors
The HS-6253 offers two NS16C550 compatible UARTs with
Read/Receive 16-byte FIFO serial ports and two internal 10-pin
headers.
CN9, CN8, CN5 and CN6: COM1/COM2/COM3/COM4
Connectors (5x2 Header)
PIN Description PIN Description
1
DCD
2
DSR
3
RXD
4
RTX
5
TXD
6
CTX
7
DTR
8
RI
9
GND
10
N/C
2
4
6
8
10
1
3
5
7
9
DSR
RTS
CTS
N/C
RI
DCD
RXD
TXD
GND
DTR
CN10: RS-422/485 Connector (5x2 Header)
PIN Description PIN Description
1
TX-
2
TX+
3
RX+
4
RX-
5
GND
6
RTS-
7
RTS+
8
CTS+
9
CTS-
10
N/C
2
4
6
8
10
1
3
5
7
9
TX+
RX-
RTS-
N/C
CTS+
TX-
RX+
GND
CTS-
RTS+
JP7: RS-422/485 Transceiver Enabled/Disabled Select
Options
Settings
Always Enable
Short 1-2
Enable by “-RTS” signal
Short 3-4
Enable by writing the REG:2 EFH
BIT0=1
Short 5-6
* Always Disabled
OPEN
1
6
5
2
