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R/C Manual 2. USING MIDI
2.2.1 Hardware Hook-up
Anything from a single 1788A to a large constellation can be controlled by indirect MIDI
through 1788A-R’s. Figure 2-5 suggests how this is done. The controller’s MIDI OUT is
connected to the first 1788A-R’s MIDI IN. The next 1788A-R’s MIDI IN is connected to the
preceding MIDI THRU, and so on.
2.2.2 Control Assertion
Depending on your needs, there are two control assertions available to MIDI:
1. Parametric control of any mic channel across the constellation.
2. Recall of one of the 60 presets that are stored in the 1788A-R’s memory.
In case 1, you will send one SysEx packet from the MIDI controller. The 1788A-R will then
redirect commands across the LAN according to Net Number within its Bank. Additional
1788A-R’s can be cascaded by using MIDI Thru looping to control more banks. In the
second case, the MIDI Preset Recall commands are shorter, containing only 2 bytes. The
following figure illustrates the composition of the parametric and recall strings.
F0 00 00 38 xx 00 xx xx xx F7
SysEx Start
1788A-R MIDI Channel
Placeholder Only
Command
Mic Channel
Value
SysEx End
*See hexadecimal conversion table.
(00 to 0F)*
Offset by -1 from 1788A-R
Channel Number
(00-0F)
Any Number Works.
(00 to 0F)*
Offset by -1 from 1788A
Net Number
See Command Table
Mic Channel (01-08)
See Command Table
Aphex MIDI I.D.
xx
1788A Net Number
Cx xx
Code
Preset Number
Range C0 to CF
(C0 added to 1788A-R Channel Number -1)
Range 01 to 3C.
Hex Value of Preset Number (0-60).
Fig. 2-6. Two Kinds of Remote Control Assertion
SysEx Parametric
Control String
The MIDI Preset Call omits the SysEx beginning and
ending bytes. When a byte starting with “C” is seen by
the 1788A-R, it recognizes the preset command. The MIDI
channel I.D. is inferred from the first byte value Cx where x
is the channel number 0h to Fh (1 to 16).
MIDI Preset
Command