DIGITAL-LOGIC AG PCCP5 Manual V2.3
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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: 16C550: 2 x 16C550 with 16 Byte FIFO
Serial Port Connectors - COM1, 2 generally
Pin Signal
Name
Function in/out DB25 Pin DB9 Pin
1 CD Data Carrier Detect in 8 1
2 DSR Data Set Ready in 6 6
3 RXD Receive Data in 3 2
4 RTS Request To Send out 4 7
5 TXD Transmit Data out 2 3
6 CTS Clear to Send in 5 8
7 DTR Data Terminal Ready out 20 4
8 RI Ring Indicator in 22 9
9 GND Signal Ground 7 5
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
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