15
15
E
4th byte, bit 8
,
arrange a 2nd bit header at the end of the input and output buffers.
0 = no
1 = yes
If this function is selected, then the minimum size of both buffers is 4 words (8 bytes) each.
4th byte, bit 7,
display state of the digital input in the bit header of the input buffer:
0 = no
1 = yes
Input is Low:
"IN" in the bit header of the input buffer = 0.
Input is High:
"IN" in the bit header of the input buffer = 1.
Important:
"KN" and "IN" use the same bit in the header. "IN" has always priority!
4th byte, bit 6
,
Head select through the "HD" bit in the bit header of the output buffer:
If Head select is selected with the "HD" bit, then the function
"both read/write heads selected" is disabled.
0 = no
1 = yes
"HD" is Low:
Select read/write Head 1.
"HD" is High:
Select read/write Head 2.
4th byte, bit 5
,
Head select through the digital input: If this is selected, then the function
"both read/write heads selected" is disabled.
0 = no
1 = yes
Input is Low:
Select read/write Head 1.
Input is High:
Select read/write Head 2.
4th byte, bit 2
,
Reset the BIS C-6_2 processor through the digital input:
0 = no
1 = yes
Input is Low:
Do not reset.
Input is High:
Reset.
Parametering Bytes
(continued)
Parametering
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Please note:
All commands
affecting Head 2 are
invalid in all versions
for a single read/
write head.
C6_2-019_641365_0506-e.p65
16
16
E
In order to transmit commands and data between the BIS C-6_2 and the host system, the
latter must prepare two fields. These two fields are:
– the output buffer
for the control commands which are sent
to
the BIS Identification System and
for the data to be written.
– the input buffer
for the data to be read and
for the designators and error codes which come
from
the BIS Identification System.
The buffer size can be selected between 6 and 32 bytes in steps of 2 bytes. This must be
given by the master during parametering. In each buffer the first byte is used as a bit header
and serves to control the command sequences. The remaining bytes are assigned depending
on command.
Note that these 8 bytes can be in two different sequences depending on the type of control.
The following description is based on sequence 1!
Sequence 1
Sequence 2
Subaddress 00
Subaddress 01
01
00
02
03
03
02
04
05
05
04
06
07
07
06
Input and Output
Buffers
Function Description
Please note the basic
procedure on 25
and the examples on
26 to 34.
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