Cobalt Digital Inc BBG-1034-AUD-PRO-DSP, Product Manual, Page: 31 / 118

BBG-1034-AUDPRO-OM (V1.6) BBG-1034-AUD-PRO-DSP PRODUCT MANUAL
2-5
Installation and Setup
GPIO, Serial (COMM), and Analog Audio Connections
GPIO, Serial (COMM), and Analog Audio Connections
Figure 2-4 shows connections to the card multi-pin terminal block connectors.
These connectors are used for card serial comm, GPIO, and balanced analog
audio connections.
Note: It is preferable to wire connections to plugs oriented as shown in
Figure 2-4
rather than assessing orientation on rear panel connectors. Note
that the orientation of 3-wire audio connectors is not necessarily consistent
within a rear panel, or between different rear panels. If wiring is first con-
nected to plug oriented as shown here, the electrical orientation will be correct
regardless of connector orientation.
Figure 2-4 COMM, GPIO, and Analog Audio Connector Pinouts
+ –
G
Removable Phoenix plug view oriented
with top (screw terminals) up
Note: Unbalanced connections can be
connected across the + and G
terminals. Note that this connection
will experience a 6 dB voltage gain
loss. Adjust gain for these connections
accordingly.
Rear panel
connector
+ - G
Balanced Analog Audio Port Connections
GPI GND connections should be connected to pin 8 –
COMM GND, which is chassis GND.
Pin Function
1 GPI IN 1
2 GPI IN 2
3 GPO RTN
4 GPO OUT 1
5 GPO OUT 2
6 UART_TX
7 UART_RX
8 COMM GND
COMM and GPIO Connections
(RJ-45 Connector)
Pin 1
Pin 8
Note: View is “looking into”
connector from
unterminated
(user-facing) side.
GPIO uses equivalent opto-isolated circuits shown below.
GPO
GPO COM
GPI
10 k
Ω
+3.3V
GPO from
card control
GPI to
card control
V+
GPO Specifications:
Max I: 120 mA
Max V: 30 V
Max P: 120 mW
Pullup R >500
Ω
resistor is recommended when using 5V control.
GPI Specifications:
GPI LO @ Vin < 1.5 V
GPI HI @ Vin > 2.3 V
Max Vin: 9 V