PPM-C412/Configuration
v1.0
www.winsystems.com
Page 30
Keyboard
An integrated 80C42 equivalent keyboard controller supports a PS/2 keyboard which is
terminated at connector
J7
. Optionally, a USB keyboard can be connected in addition to,
or instead of the standard PS/2 keyboard.
Mouse Interface
A PS/2 mouse port provides connection for a compatible mouse and is terminated at
connector
J7
. Optionally, a USB mouse can be connected in addition to, or instead of
the standard PS/2 mouse.
Serial Connectors
Four independent, asynchronous serial channels are on-board. The interface is provided
at connector
J7
, which is an 80-pin, high-density connector. WinSystems offers the
cable CBL-251-G-1-1.5 to simplify the connection. This cable is included in the cable set
CBL-SET-412-1. Configuration options for RS-232, RS-422, and RS-485 are listed
below.
All serial channels are configured as data terminal equipment (DTE). Both the send and
receive registers of each channel have a 16-byte FIFO. All serial ports have
16C550-compatible UARTs.
Independent control of transmit, receive, line status, and data set interrupts are on all
channels. Each channel is setup to provide internal diagnostics such as loopback and
echo mode on the data stream. An independent, software programmable baud rate
generator is selectable from 50 to 115.2 kbps. Individual modem handshake control
signals are supported for all channels.
RS-232 interface levels are supported on all four serial ports. The RS-232 drivers have a
charge pump to generate the plus and minus voltages so that the PPM-C412 only
re5V to operate.
All COM ports support RS-232 and can be enabled in the BIOS. COM1 and COM2 also
have RS-422/RS-485 support. RS-422/485 provides separate balanced transmit and
receive signal pairs. For RS-485 multidrop lines, one signal pair can be used for “party
line” network structures.
See “BIOS” on page 43 for further details.
COM1 and COM2 Configuration Options
1. Internal loopback
2. RS-422 mode
3. RS-422 mode with auto transmitter enable - (TX Direction = TXD)
4. RS-485 mode with auto transmitter enable - (TX Direction = TXD)