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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 Available I/O rack cards
Depending on your audio-connections, you can select the I/O cards.
The next paragraphs will give you a detailed overview on the currently available cards.
10.1 MIC input card
There are four balanced MIC inputs available on each card.
Each RJ45 connector represents a MIC input and two GPIO’s which can be connected to
the 19” patch panels with a shielded twisted pair (STP) cable.
On each MIC input you can individual activate the +48V phantom power and PAD.
For each GPIO you can choose, by way of a hardware jumper on the 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 10-1: MIC RJ45 connection
Pin Con. Pair
Pin name
Function
Comment
1
1A
1
+Audio 1
MIC input in-phase
Imp. 2kΩ
max. level +20dBu
2
1B
-Audio 1
MIC input out-phase
3
2A
2
+Audio 2
not used
6
2B
-Audio 2
not used
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
