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4.3.4 Serial Ports COM1-COM2
The serial channels are fully compatible with 16C550 UARTS. COM1 is the primary serial port, and is sup-
ported by the board's ROM-BIOS as the PC-DOS 'COM1' device. The secondary serial port is COM2; it is
supported as the 'COM2' device.
Standard:
COM 1/2:
Serial Port Connectors - COM1, 2 generally
Pin
Signal
Name
1
CD
2
DSR
3
RXD
4
RTS
5
TXD
6
CTS
7
DTR
8
RI
9
GND
The serial port signals are compatible with the RS232C specifications.
Until boardversion V2.1, the RS422/485 (2wire) was an assembling option instead of the RS232
-
-
Since boardversionV2.2, connector J91 and J93 are RS422/485 (4wire) ports
16C550:
Function
Data Carrier Detect
Data Set Ready
Receive Data
Request To Send
Transmit Data
Clear to Send
Data Terminal Ready
Ring Indicator
Signal Ground
2 x 16C550 with 16 Byte FIFO
in/out
DB25 Pin
in
8
in
6
in
3
out
4
out
2
in
5
out
20
in
22
7
23
PCCP5 Manual V2.3
DB9 Pin
1
6
2
7
3
8
4
9
5
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