Pelco DX3000 - Manual (Page 15)

14 Pelco Manual C681M-D (2/02)
REC ALARM-OUT POWER OFF POWER ON MODE-OUT CALL OUT GND CALL OUT DC 5V OUT MAX 30mA CLOCK ADJUST REC POWER ON POWER OFF ALARM OUT MODE OUT CALL OUT CALL OUT GND
First Unit Second Unit
GND GND GND GND GND
<Interface circuit inside the unit>
5V
5V 10k Ω
22k Ω Input
terminal
0.047 µ F
GND
POWER ON/POWER OFF/
ALARM IN/REC/CLOCK ADJ
Input terminal
• Input Circuit
<Interface circuit inside the unit>
Output terminal
GND terminal
ALARM OUT/MODE OUT Output terminal
• Output Circuit
<Interface circuit inside the unit>
CALL OUT terminal
CALL OUT GND terminal
CALL OUT output terminal
• Output Circuit
The REC input terminal is used to start recording. Refer to Series Recording in this step for
more information. The input is active when a ground or low voltage signal is applied. The in-
put is non-active when the terminal is open.
The MODE OUT output terminal is used to indicate the status of the recorder (refer to Mode
Out in the Programming section for more information). It can also be used to turn on an-
other recorder (refer to
Series Recording in this step for more information). The output is
active when the terminal is at a low voltage level and non-active when the terminal is open.
Maximum current drive is 7 mA DC, and the maximum voltage is +24 VDC.
The CALL OUT output terminal is used for warnings (refer to the Warnings section for more
information). It can also be used to turn on another recorder (refer to Series Recording in
this step for more information). The output is active when the optical coupler is turned on
and non-active when the optical coupler is turned off. Maximum current drive is 7 mA DC,
and the maximum voltage is +24 VDC.
Figure 10. Schematics for Input and Output Terminals
SERIES RECORDING
By connecting multiple units in series as shown in Figure 11, when the one unit’s hard disk
is full, the next unit automatically begins recording.
In this example, when the first unit’s hard disk is full, the second unit begins recording;
when the second unit’s hard disk is full, the first unit begins overwriting its hard disk. If you
do not want the first unit to overwrite its hard disk, do not connect MODE OUT from the
second unit to REC of the first unit. The series recording function can also be activated by
connecting the CALL OUT terminal in place of the MODE OUT terminal; the disk storage
capacity setting is made in the Call Out menu. When the CALL OUT terminal is used, if the
first unit reaches the preset capacity, experiences a malfunction, or otherwise cannot con-
tinue recording, the second unit begins recording.
Figure 11. Connecting Recorders in Series