Timewave DSP-232, Operating Manual

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Chapter 4 Terminal Interfacing
Typing “FREE” displays the number of usable bytes left in the MailDrop, as in “FREE 16996.” This may be useful
to a Host mode application using the MailDrop.
Help
Immediate Command
Host: Not Supported
While in Command mode, type
H
to read the abbreviated on-line
HELP
file which lists the available modes to you
from your DSP. Your monitor will display the following brief list:
cmd:
HELP
AScii AMtor PAcket
BAudot ARq
Connect
MOrse AList Disconne
DISPlay FEc
MHeard
CALibrat AChg CStatus
NAvtex SIgnal FAx TDm
PACTOr PTConn PTSend PTList
CONVerse Trans
Opmode Xmit
Rcve Lock
RESTART RESET MDCheck TClear
Host n Default: 0
Host: HO
“
n ” A hexadecimal value from $00 through $FF setting bits from the table below that define the Host operation
of the DSP.
The Host command enables the “computer-friendly” Host communications mode over the DSP’s RS-232 link. To
exit out of the Host mode, enter three (
CTRL-C ) characters in rapid succession or type ( CTRL-
A
),
O
,
H
,
O
,
N
,(
CTRL-W
). Sending a Break signal won’t cause the DSP to exit from the Host mode.
Bit 0: Controls whether the Host mode is
ON
or
OFF
.
If bit 0 is equal to 0 , Host is OFF .
If bit 0 is equal to
1
, Host is
ON
.
Bit 1: Controls the local MailDrop access.
If bit 1 is
0
, then the MailDrop Send data uses the $20 block. Read data uses the $2F block as
before. Monitored MXMIT data uses the $3F (monitored receive) block type.
If bit 1 is 1 , then the MailDrop send data uses the $60 block type. Read data uses the $70 block
type. Monitored
MXMIT
data uses the $2F (echoed) block type to differentiate between monitored
transmitted and received frames.
Bit 2:
Controls the DSP-2232 and PK-900 extended Host mode. (This isn’t used in the DSP-232.)
Bits 3-7 are reserved for future use.
To maintain backward compatibility with older programs written to use the
ON
|
OFF
form of the Host command,
Host ON is equivalent to Host $01 described above. However, programmers must note that Host now returns a
numeric value and not
ON
or
OFF
as before.
HPoll ON | OFF Default: ON
Host: HP
ON
The Host mode program must poll the DSP for all data (default).
September, 05 4-17