OPTICAL SYSTEMS DESIGN
DOC ID: 10111701
OSD9003/OSD9004 OPERATOR MANUAL
PAGE 8
2.5
OPERATION AND CONNECTIONS
2.5.1
POWER SUPPLY CONNECTIONS
The OSD9003/OSD9004 module requires external 9 to 28V
DC
@ 3VA. Power should be connected to
the power socket located at the back of the case as indicated in Table 3.
TABLE 3: DC OR AC POWER CONNECTION
External Power Pin
Specification
Pin 1
9 to 28V
DC
@ 3VA
Pin 2
Ground – 0V
Pin 3
Remote Alarm
FIGURE 3: OSD9003/9004 POWER SUPPLY CONNECTIONS
2.5.2
REMOTE ALARM CONNECTIONS
The OSD9003/OSD9004 provides a remote alarm connection located on pin 3 of the 3-way
power/alarm connector (see Figure 3). Open drain alarm output sinks current in the absence of an alarm
condition. When an alarm occurs, the output goes into a high impedance state.
When power to the OSD9003 unit is switched off or the laser current monitor indicates laser fail mode
Pin 3 becomes open circuit. The unit’s monitoring circuit connects Pin3 to Pin2 (circuit ground) when
there is no fault.
When power to the OSD9004 unit is switched off or there is a optical loss condition Pin 3 becomes
open circuit. The unit’s monitoring circuit connects Pin 3 to Pin 2 (circuit ground) when there is no
fault.
Power/Alarm Connector
3 2 1
