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PK-232 TECHNICAL MANUAL
o
Next come the literal command or data characters.
o
Each block end with $17 or ^W, the ETB (End of Transmission Block) character.
Therefore, in Host mode, each block appears as follows:
[SOH] [CTL] [data] [ETB]
In addition, DLE (Data Link Escape), $10 may be used as a pass character.
o
If one of the data field characters is SOH ($01), DLE ($10) or ETB ($17), the pass
character DLE ($10) is inserted before the data character.
For example, data consisting of the bytes $04, $01, $05, $10, $12 is sent to channel 0 in
this block:
$01
SOH
This occurs in either direction, from the computer to the PK-232 or from the PK-232 to the
computer.
4.1.6
Host Mode Recovery
If it becomes necessary to quit Host mode because of a problem on the RS-232 link, send
any command, with TWO SOH characters to start the block. This makes sure the PK-232
goes to a known state where it is processing commands. A suggestion:
$01
SOH
4.2
Host Computer Commands
The host computer send blocks to the PK-232 using the CTL bytes:
$2x: Data to channel x, where x = 0-9
$4x: Command to channel x
$4F: Command, no change to input channel
The computer sends commands to the PK-232 in the following format:
SOH $4F
a
b
where
and
mand.
o
When setting a parameter, do not send the SPACE character between the command
and the first argument.
o
Arguments are entered just as in the verbose mode, with space characters or com-
mas between arguments.
o
The command ends with ETB, without a carriage return before it.
PK232TM Rev. A 5/87
$20
$04
$10
CTL
data
DLE
$01
$4F
$47
SOH
O
G
a b
(any data) ETB
are the two character Host mode mnemonic or abbreviation for that com-
CHAPTER 4 – HOST MODE AND SPECIAL APPLICATIONS
$01
$05
$10
data
data
DLE
$47
$17
G
ETB
4-3
$10
$12
$17
data
data
ETB
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Table of Contents
Troubleshooting
