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Using PCI Serial with Linux 4 www.natinst.com
Quick Start
This section is for experienced Linux users who are familiar with the
lspci and setserial tools. If you are not familiar with either of these
tools or if you require a detailed explanation of the steps, skip to the next
section, Setup.
1. If you do not have enough available serial devices (
/dev/ttyS*) for
each port on your multiport interface, create a new serial device by
entering the following:
linux# cd /dev
linux /dev# ./MAKEDEV ttyS<
port number
>
2. Find the port address, IRQ, and memory assignment of your PCI serial
interface by enter the following:
linux# lspci -v -n -d 1093:*
3. Assign the serial driver to your devices. Make sure you precede the
port addresses with
0x.
• For a PCI-232 interface, enter the following:
linux# setserial /dev/ttyS<
port number
> uart
16550a port <
port address
> irq <
irq
>
^fourport
• For a PCI-485 interface, which supports a higher baud_base of
460.8K at startup, enter the following:
linux# setserial /dev/ttyS<
port number
> uart
16550a port <
port address
> irq <
irq
>
baud_base 460800 ^fourport
4. Enable the PCI interrupt on your interface. To use intenable (from
the
PCI-SERIAL directory) to enable interrupts on your PCI serial
interface, enter the following:
linux PCI-SERIAL# ./intenable <
pci memory address
found in lspci
>
5. If you have a PCI-485 interface, set the transceiver mode for each serial
port. Refer to the section Select Transceiver Mode for more
information about selecting a PCI-485 transceiver mode.
6. After you connect a cable between the two ports, test the setup by
running
serialtest (from the PCI-SERIAL directory).
linux# ./serialtest <
receive port number
> <
transmit
port number
>