TDT RZ2 Manual page 162

3-30
When the Bits lights are configured to display the amplifier status, the left column of
lights indicates the power status and the right column indicates a clip warning for the
corresponding amplifier.
"Amplifier Status Patterns" on page 3-29 shows the light pattern and corresponding
amplifier status for the power status lights (0 - 3). Clip lights flash very rapidly
when any channel on the connected amplifier produces a voltage approaching the
maximum input of the amplifier.
Analog Output
The RX5 is equipped with four channels of 16-bit PCM D/A. The sampling rate is
user selectable up to a maximum of ~100 kHz. The D/A is DC coupled and has a
built-in upsampler for improved audio playback. The upsampler is controlled through
one of the RX5's programmable bits and can be turned off to allow the D/A to
drive external devices such as a stimulator. Channel one analog output can be
accessed via a front Panel BNC (DAC-1). All four analog channels can be
accessed via the DB25 Multi I/O connector (pins 14 – 17).
Digital I/O
The RX5 processor has 40 digital I/O lines. Eight bits are bit-addressable. The
remaining 32 bits are four word-addressable bytes. Digital I/O lines are accessed
via the two 25-pin connectors on the front of the RX5. See the "Digital I/O Circuit
Design" section of the
digital I/O.
CAUTION!: The first eight bits of bit-addressable digital I/O on RX devices
are unbuffered. When used as inputs, overvoltages on these lines can cause severe
damage to the system. TDT recommends when sending digital signals into the
device, never send a signal with amplitude greater than five volts into any digital
input.
Configuring the Programmable I/O Lines
Each of the eight bit-addressable lines can be independently configured as inputs or
outputs. The digital I/O lines can be configured as inputs or outputs in groups of
eight bits – that is as byte A, byte B, byte C, and byte D. Note, however, that the
bytes must be addressed as if part of a word, not as individual bytes. See
"Addressing Digital Bits In A Word" in the
By default, all bits are configured as inputs. This default setting is intended to
prevent damage to equipment that might be connected to the digital I/O lines. The
user can configure the bits in the RPvdsEx configuration register. The configuration
register is also used to determine what the eight front panel Bits lights represent.
To access the bit configuration register in RPvdsEx:
1.
2. In the Set Hardware Parameters dialog box, click the Device Type box
RX5 Pentusa Base Station
RPvdsEx Manual
Click the Device Setup command on the Implement menu.
and select the RX5 Pentusa from the list.
The dialog expands to display the Device Configuration Register.
for more information on programming the
RPvdsEx Manual
for more information.
System 3