Clear-Com Eclipse Median, Инструкция по эксплуатации, Страница: 87 / 114

Vitec Group Communications
Eclipse Median Instruction Manual 5 - 1 9
require that the externally connected equipment powers the
general-purpose input. The current is supplied by a voltage output on
the GP IN connector.
To select a mode, move the J1 jumper on the CPU rear card to one of
two positions. (The J1 jumper is located on the inner-matrix side of the
DB-25 connector.)
• For opto-isolated mode, fit the J1 jumper across pins 1 and 2.
• For non-isolated mode, fit the J1 jumper across pins 2 and 3.
Note: It is recommended that you set the connector to the fully
opto-isolated mode.
Opto-Isolated Mode
Figure 5-13 shows the opto-isolated connection.
Figure 5-13: Opto-Isolated Connection to Eclipse Median GPI Connec-
tor
In this mode, a DC voltage of between 7 and 24 volts is required at the
pin with relation to the EXTVIN– pin. To cause an input to
detect an active signal, you must send current from the relevant input
pin.
The external device should draw no current to cause an inactive input
and at least 5 mA to cause an active input. The opto-isolator drive line
contains a 1.5 kOhm resistor to limit the current through the
opto-isolator. You can therefore connect the input pins directly to the
EXTVIN– level to cause an active input.
The voltage level at the external input pin should not be allowed to go
below EXTVIN– or above +6 V with respect to EXTVIN–.
Non-Isolated Mode
Figure 5-14 shows the non-isolated connection.
+ C
10uF_10V D
BYG22D + C
10uF_25V
INPUT 1 EXTVIN-
EXTERNAL INPUT 2
INPUT 2
R29 1.5K
U
LM78L05ACM
VIN
8
VOUT
1
7-24V
R30 1.5K
U
MOCD207-M
1
3
2
4
8
7
6
5
EXTERNAL INPUT 1
R
33K2
+3V3
R
33K2
+3V3