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1990-06-11
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DigiWARE Release Notes
for
DMODE
Introduction
DMODE is a 'work-alike' of the MODE command under OS/2 but with a
number of added features and a few different rules of behavior.
It came to the attention of the DigiBoard Technical Support Staff
that the standard MODE command -- though useful for many things --
was limited in the following ways:
-- No communications device names besides COM1 - COM8 could be used.
-- Baud rates above 9600 could not be assigned.
-- Timeout, Handshake signals, etc. could not be set without having
to respecify the Baud rate, Parity and Data type parameters.
-- If any of the set of Baud_rate:Parity:Databits:Stopbits was left
off the command line, MODE would assign them to ITS defaults of
1200,e,7,1, instead of the defaults of whatever those values are
CURRENTLY set to. Thus a user wanting only to change Baud rate
would unknowingly also reset the Data type and Parity of the
device.
DMODE addresses these issues while attempting to remain compliant
with the familiar MODE command syntax.
In general, DMODE attempts to forgive as much as possible in terms
of both the order of the arguments and as each argument's
requirements for other unrelated arguments. Given the limited range
of values that most of the parameters can assume, DMODE will assign
a parameter based on its value instead of its position in the command
line. The syntax of the DMODE command is then
DMODE device-name[:] [arguments]
where the device name must be the name of a character-device that
supports Generic IOCtl system calls. The Colon is optional and is
there only to be backward compatible with MODE. The remainder of
the arguments are parsed according the following rules. The
arguments may appear in any order and must be separated from
each other with a space and/or comma. Any parameters left unspecified
on the command line will be left in their current settings. In any
case, DMODE will report the current settings of all parameters AFTER
such changes as requested on the command line have been assigned.
Thus with no arguments (i.e. no changes to current settings), DMODE
simply reports the current settings.
Baud Rate Rules:
Baud Rates parameters are recognized to be any 2 to 5 decimal
digit argument to be mapped as follows.
Accepted values.... Assigned Baud rate
-----------------------------------------------------------
11 110 110
15 150 150
30 300 300
60 600 600
12 120 1200 1200
24 240 2400 2400
48 480 4800 4800
96 960 9600 9600
19 192 1920 19200 19200
38 384 3840 38400 38400
Data Bit Rules:
Data Bit parameters are recognized to be any 1 digit
consisting of 5,6,7, or 8.
Stop Bit Rules:
Stop Bit parameters are recognized to be any argument with
the value of 1, 2, or 1.5.
Parity Rules:
The Parity parameter is recognized to be any single-letter
argument with the value of E, O, N, M, S -- For (E)ven,
(O)dd, (N)one, (M)ark, and (S)pace. Upper or lower case letters
are acceptable.
Handshake Signals and Timeout parameter Rules:
These arguments follow the documentation for standard MODE command.
The accepted signal names are listed below. In all cases the
name and assignment may be in any mix of upper an lower
case characters.
Full name Argument State Assignments
-----------------------------------------------------
Read-timeout TO ON OFF
Xon/Xoff handshake XON ON OFF
Input DSR sensitivity IDSR ON OFF
Output DSR sensitivity ODSR ON OFF
Output handshake on CTS OCTS ON OFF
DTR signal control DTR ON OFF HS
RTS signal control RTS ON OFF HS TOG
Examples:
dmode digi12 [ interrogative; no settings changed ]
dmode com5 2 [ the '2' assumed to be stop bits.. ]
dmode com5:38 rts=ON [ the '38' is parsed to the baud rate]
[ of 38.4K baud, and RTS is turned ON]
dmode com5 8 [ the '8' parsed as data bits ]
dmode comdev83 IDSR=OFF,TO=off e 7 12
[ IDSR is turned OFF, timeout on reads]
[ is set to off, Even-parity is set, ]
[ 7 data bits is set, 1200 baud is set]