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FIRMWARE
Host CPU to iSBC Controller Messages
B.3.2.1.2
ENABLE. This command is used by the host CPU to enable
a serial channel. Once enabled, other commands can be directed to
the channel.
The firmware enables the serial channel's receiver
and transmitter
only on this command. The RTS and DTR modem control signals are
asserted and cleared respectively.
An Enable Line command, received when the line is already enabled
is ignored by the controllers.
An Enable Command to the line printer causes a reset pulse to be
issued to the line printer.
The Enable message format is shown in Figure B-7.
Message Format
o
02H
1
Line Number
2
Reserved
15
Reserved
NOTE
Reserved space
should be set to
00 (H) •
Line Number
The serial channel being enabled
Response
None
Figure B-7.
Enable Message Format
B-13
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