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Device
and operation
CPC307
C P C 3 0 7 U s e r M a n u a l
45
© 2 0 2 2 F a s t w e l v . 0 0 6
The recommended mating part is 2039-3101 (ribbon cable press-on socket) or Leotronics 2022-
2102 (socket) and 2023-2000 set of contacts.
Attention!
At ambient temperatures below 0 ºC, the real exchange rate of the Ethernet port may
decrease. For example, at ambient temperature of -
30 ºC and below the real
exchange speed may decrease to 10 Mbit/sec even if the mode is set to 100
Mbit/sec.
To solve this problem you need to update your BIOS to version 3.25 or newer (BIOS release date
should be 04.12.2017 or later).
Table 4.14. Pin assignment of the XP9 connector of Ethernet-port
Pin
Signal
Pin
Signal
1
TX1+ (Ethernet1)
2
TX1- (Ethernet1)
3
RX1+ (Ethernet1)
4
RX1- (Ethernet1)
5
–
6
–
7
–
8
–
9
–
10
–
Figure 4.15. Numbering pins of the XP9 connector
4.3.10 Serial ports
4.3.10.1 COM1 and COM2
COM1 and COM2 ports operate in RS-232 or RS-485/422 interface mode and have standard
PC/AT base addresses. The interrupt line and base address for the serial ports are selected in the
BIOS Setup menu.
The mode of each port is set in the BIOS Setup menu or by controlling the GPIO2 port (paragraph
4.3.19 GPIO Ports). The default operating mode for COM1 and COM2 is RS-232.
The maximum baud rate for COM1 and COM2 ports is 115.2 kbaud. The ports are fully software
compatible with the UART 16550 model.
The transmitters in the RS-422/485 mode are hardware controlled. The mode of operation of each
port is selected independently of the other.
When using the COM1 and COM2 serial ports, the maximum number of connected devices is
limited: 16.
RS-232 Operation Mode
In RS-232 mode the ports operate as a full-fledged 9-wire interface.
For COM1 port, the RS-232 mode is set by shifting GPIO2 port line 0 to
“1” and setting the line
direction to "out".