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M User Manual
Version 2.5 - 2011-01-28
AXUM from D&R - Phone: +31 294 418014 - E-Mail:
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10.3 Digital in/output card (optional SRC)
There are four balanced digital inputs and outputs available on each card.
Each RJ45 connector represents a stereo line input and two GPIO’s which can be
connected to the 19” patch panels with a shielded twisted pair (STP) cable.
There is also a card available with built in sample rate converters (SRC).
For each GPIO you can choose, by way of a hardware jumper on de board, between TTL
Input/output or Photo-MOS relay output see chapter 11.3.1 GPIO TTL/Relay selection. For
software configuration see chapter 9.3 GPIO.
Table 10-3: Digital input/output RJ45 connection
With jumper on the I/O card it is possible to select the impedance for S/P-DIF (75
Ω
) or AES-3 (110
Ω)
This figures shows the jumper location on the I/O card
Figure 46: Digital S/P-DIF or AES3 selection
Pin Con. Pair
Pin name
Function
Comment
1
1A
1
+Audio 1
Digital input in-phase
Imp.
110Ω/75Ω
optional SRC:
32..96kHz
2
1B
-Audio 1
Digital input out-phase
3
2A
2
+Audio 2
Digital output in-phase
Imp. 110Ω/75Ω
32, 44.1, 48kHz
6
2B
-Audio 2
Digital output out-phase
If jumper TTL-GPIO If jumper GPO
see chapter 11.3.1
5
3A
3
GPIO1a
GP-Out
(TTL)
Photo MOS relay
(max 50V, 200mA)
4
3B
GPIO1b
nGP-In
(TTL)
7
4A
4
GPIO2a
GP-Out
(TTL)
Photo MOS relay
(max 50V, 200mA)
see chapter 11.3.1
8
4B
GPIO2b
nGP-In
(TTL)
S
GND S
Shield
GND
Audio ground and
reference for GP-In
