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Channel In terf ace
7942 and 7946
Table 2-1. Device Command Summary (continued)
SET UNIT
(COMPLEMENTARY)
FUNCTION:
Used to specify a specific unit within the device.
OPCODE:
32 10
00100000
2
040
8
20 16
33 10
00100001
2
041
8
21 16
47 10
00101111
2
057
8
2F 16
FORM,AT:
<0010YYYY>
YYYY
=
unit number
(1111
device controller)
INITIA l"E UTILITY
(DIAGNOSTIC)
FUNCTION:
OPCODE:
FORMAT:
Directs the device to perform one utility routine.
48 10
00110000
2
060
8
30 16
49 10
00110001
2
061
8
31 16
5010
00110010
2
062
8
32 16
<001000XX>
<
Pl
> < n parameter
xx
=
execution message qualifier
00
=
no execution message
bytes >
01
=
device will receive execution message
10
=
device will send execution message
Pl
=
utility number (device specific)
There can be up to 8 bytes in the parameter field. The
number and content of these bytes is determined by
Pl.
INITIA l"E DIAGNOSTIC
(DIAGNOSTIC)
FUNCTION:
OPCODE:
FORM,AT:
Directs the device to perform one internally defined diagnos-
tic routine.
<00110011>
<
Pl
<
P2
<
P3
>
Pl-P2
=
loop parameter
P3
=
diagnostic section number
NO OP
(COMPLEMENTARY)
FUNCTION:
Causes the device to disregard the message byte.
OPCODE:
FORM,AT:
No variables or parameters
2-5
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