User manual

Chapter 3: Software Installation - DOS 3-3
Echo User's Manual, ver. 0.00
DFLEX.SYS
DLEX.SYS is a device driver that allows you to set port
addresses for software access of up to 32 ports . To install the
device driver, add the following command to your
CONFIG.SYS
file:
DEVICE = DFLEX.SYS [options]
Where
[options] are:
P=hhh
hhh
specifies the I/O address of the ST16C554
UART.
N=d
this parameter specifies an offset for the
communication port numbers to start at.
D=name
this parameter changes the name of the ports to
something other than COM.
Note: You must specify at least one option
Example 1:
( com1 .. com8 )
DEVICE=DFLEX.SYS P=3f8 P=2f8 P=210 P=218 P=220 P=228 P=230 P=238
Example 2:
( com3 .. com10 )
DEVICE= DFLEX.SYS P=200 P=208 P=210 P=218 P=220 P=228 P=230
P=238 N=3
Example 3:
( serial1 .. serial8 )
DEVICE= DFLEX.SYS P=330 P=338 P=340 P=348 P=350 P=358 P=360
P=368 D=SERIAL
CTIMODE
The
CTIMODE command allows you to configure the extra serial
ports. It is used with the
COM name:
CTIMODE COMn:baud,parity,databits,stopbits
Accessing Ports
You can access the ST16C554 UARTS from DOS through the
driver
DLFEX.SYS. We provide two methods of access; character
device access and software interrupt 14h access.