PK-232 TECHNICAL MANUAL
CHAPTER 4 – HOST MODE AND SPECIAL APPLICATIONS
PK232TM Rev. A 5/87
4-14
Page 31
4.8
Maximum Block Size
For blocks sent by the host computer to the PK-232, maximum block size is 330 characters,
not including SOH, CTL, DLE and ETB.
For blocks sent by the PK-232 to the host, maximum block size depends on the communica-
tions mode.
o
In Morse, Baudot ASCII and AMTOR, the received and echoed data is divided into
blocks containing a maximum of 256 bytes, not including SOH, CTL, DLE and ETB.
o
In Packet, the worst-case is a monitored frame containing the addresses of eight
digipeaters and 256 bytes of data, with the PK-232's MSTAMP, DAYSTAMP and MRPT
parameters all set to ON, and MONTITOR set to 6.
This worst-case configration produces a maximum of 136 + 256, or 392 bytes, not
including SOH, CTL, DLE and ETB. By stuffing couls add as many as 256 additional
DLE characters, for a total of 648 bytes.
If CONMODE is CONVERSE, linefeed characters may be appended to carriage re-
turns because ALFDISP is active. Theoretically, a packet contains 256 carriage re-
turns would result in a block of 136 + 256 + 256, or 648 bytes, plus SOH, CTL and
ETB.
4.9
MEMORY, I/O and ADDRESS Commands
The Memory and I/O commands work with the ADDRESS command to permit host access to
the PK-232's mmory an I/O locations.
4.9.1
MEMORY Command
To use the Memory command:
o
Set the memory address into the ADDRESS command.
o
Use the MEMORY command without arguments to read memory locations one after
another.
o
Use MEMORY with one argument 0-$FF to write to memory locations. After each
MEMORY command, the PK-232 adds 1 to the value of the ADDRESS.
PK-232 RAM locations are $C0000-$FFFF. ROM begins at $0000.
4.9.2
ADDRESS Command
To access I/O locations, set ADDRESS as follows:
ADDRESS $
aabb
or
SOH $4F A E $
a a b b
ETB (host mode)
where
aa
is the device address:
7C = 8530 terminal CTRL port
7E = 8530 HDLC CTRL port
BF = 8536 timer/parallel CTRL port
and
bb
is the register address on the device.
Summary of Contents for PAKRATT PK-232
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