Making a list of all presets, including a name for each preset.
The name should describe the I/O configuration stored in the
preset, will help you identify them later.
To store a preset:
1.
Configure the inputs and outputs as you want to save
them.
2.
Press <Preset> twice; the PRESET LED begins flashing,
indicating that the distribution matrix is in store preset
mode.
3.
Press a matrix key and then an input/output key to assign
an identity to the current I/O configuration of the
distribution matrix.
For example, to store the current I/O configuration as
preset 35, press Matrix key #3 (which sets the range of
the input/output keys to 33-48) and then press
Input/Output key #3 (preset #35 in the Matrix key #3 I/O
key range).
Caution:
When storing a preset, if you assign an identity
that was previously assigned to an I/O configura-
tion, the new I/O configuration overwrites the old
I/O configuration in memory.
4.
Press <Take> to store the preset; the 1YDM returns to
status mode.
To recall a preset:
When a preset is recalled, the I/O configuration of the distri-
bution matrix is restored to the state it was in when the
preset was saved.
1.
Press <Preset>; the PRESET LED illuminates, indicating
that the distribution matrix is in preset recall mode.
2.
Press the matrix and input/output keys that correspond to
the number of the configuration you wish to recall.
3.
Press <Take>; the distribution matrix switches to the
desired configuration and then returns to status mode.
2.5.1
Dry Contacts and Presets
Presets can also be used with dry contacts. Dry contacts re-
call presets using digital (TTL) level lines. The dry contact
port is a 10-pin single in-line header labeled P1 on the CPU
board. It is located between the Power On LED and serial
port 1 on the CPU board (see figure 2.2). Single In-line Pack-
age (SIP) pins 1-7 are dry contact data lines internally pulled
up. Pin 8 is the falling-edge active strobe line. Pin 9 is
ground. Preset calculation using dry contacts is performed by
taking the two’s complement (invert and add 1) of the data
presented, in binary, on the dry contact data lines.
2-5
Operating the Distribution Matrix
