Timewave PK-900, Operating Manual

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ZStatus Immediate Command
Mode: All Host: ZS
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This command is primarily of interest to HOST mode programmers. ZSTATUS is an
immediate read-only command that returns a data byte in hexadecimal indicating
the status of the unit as shown in the table below.
Bit Meaning if 0 Meaning if 1
--- ------------ ------------
0 Transmit character RTTY & AMTOR characters
buffer is empty are being transmitted
1 No maildrop command Maildrop command is
in progress in progress
2 No maildrop messages The maildrop contains
for local sysop messages for local sysop
3-7 Reserved Reserved
ZSTATUS is meant to be a read-only command for use by host applications in
determining the status of the unit, although the user may write a value to
ZSTATUS if desired. Bit 0 shows whether all characters have been transmitted
in non-packet modes. Bit 1 shows whether the maildrop is busy servicing a
command such as Read or List. (Note: bit 1 may show 0 before the host
application has polled all the data from a Read or List command out of one of
the unit's buffers.) Bit 2 shows whether any mail has been sent to the local
sysop (same indication as the front panel MAIL LCD flashing).
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