Specifications

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17
ADMS 44.22 Installation and Operation Manual
INSTALLATION
own RS-232 serial port, as shown in the diagram below.
The advantage of using a USB to RS-232 adapter is that each ADMS 44.22
unit can be set to ID = 0, allowing the terminal application to receive automated
responses from each unit and Menu Mode operation. Terminal applications such as
VanDykeTM CRT allow the operator to individually setup and control each RS-232
com port from within its own tab so that all ADMS 44.22 units can be controlled
from a single terminal application.
2.10 Remote Control / GPI (PIP) Inputs
The sixteen Remote Control / GPI (PIP) inputs are available through the upper 18-
position removable Euroblock connector on the rear panel, as shown in the picture below.
In Remote Mode the first eight inputs control the Analog 1 - 4 and AES 1 –
4 front panel buttons, respectively, while Inputs 9 - 12 are control the OP2, Fade,
Dim, and Mute buttons. Input 13 mutes the Powered Monitor output, while Inputs
14 through 16 are not used. In GPI Mode all 16 Inputs may be used.
Inputs are pulled high to 3.3 volts through an internal 20k? resistor and are acti-
vated by pulling the input to ground (active low) through a momentary external contact
closure or TTL/CMOS open collector output capable of sinking at least 170μA of cur-
rent. The inputs are internally debounced and require a minimum input pulse duration
of 60ms for the input status to be set true (On). The inputs labeled ‘G’ are connected to
internal ground and can be used for ground-referencing external input logic circuits.
2.11 Status / GPO Outputs
The nine Status / GPO (labeled OC1 through OC9) are available through the
lower 18-position removable Euroblock connector on the rear panel, as shown in the
picture in the preceding section. In Status Mode, outputs OC1 through OC8 reflect the
status of Analog Inputs 1 – 4 and AES Inputs 1 – 4, respectively, while OC9 reflects
the status of the front panel SS Alarm LED. In GPO Mode each of the OC outputs can
be individually controlled from the terminal to control various external devices.
Each open collector outputs is active low, and can sink up to 350mA of cur-
rent with TTL/CMOS output voltages. The ADMS 44.22 open collector outputs do
not have internal pull-up resistors. Therefore to correctly drive TTL/CMOS logic
inputs, an external DC voltage source (Voc) must be connected to the OC output
through a pull-up resistor (Roc), as shown in the diagram below. Voc must range
from 2 - 5Vdc and Roc should be calculated so that when the OC output is off (logic
high), the OC output will have sufficient current to drive the TTL/CMOS input high.
The terminal labeled ‘G’ at the center of the terminal block is connected to internal
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GP Input / GPO Output Connectors