User Manual

ParSec Reader Installation Manual - Issue:2 - January 1998 - Page 16
operated, it cannot be re-operated until a time equal to its set time has elapsed. For example,
if you set S12 for 5 minutes and a tag is read which causes it to operate for 5 minutes, then it
will not operate again until a further 5 minutes have passed.
4.5.
PIR Operation
The default state of switch S11/1 is ON, which disables PIR usage. If either, or both internal
and external PIRs are used, switch S11/1 should be set to OFF.
4.5.1. The Internal PIR
The internal PIR is not fitted with any lens and is only a crude presence detector with very
limited range. Where a more specific zone of detection is required it is recommended that and
external PIR is used. To use the internal PIR, switches S11/1&2 should both be set to OFF.
4.5.2. Using an External PIR
An external PIR may be connected via the Backplane Connector PCB - see Section 3.2 for
terminal identification.
When an external PIR is used, switch S11/2 should be set to the ON position.
Notes
(1) It is possible to enable both the internal and external PIRs - switches S11/2 &
3 should both be set to ON.
(2) It is important that switch S11/1 is set to the OFF position for the PIRs to
operate.
(3) When neither PIR is required, it is important that switch 11/1 is set ON with
switches S11/2 & 3 set OFF otherwise the reader will not detect either
Portable or Personnel Tags.
(4) When setting the scan range using the RAT (Section 4.2.1), switch S11/1 must
be ON.
4.6. Setting up the Communications Interfaces
4.6.1. Baud Rate Programming for RS-232 Data Comms
The default RS-232 port speed is 9,600 baud, with switch S13/2 set to OFF.
A reduced speed of 2,400 baud is available by setting switch S13/2 to ON. It is not necessary
to power down/up to change this setting. The lower speed allows cable lengths up to 60m to
be used; 9600 baud is limited to 15m.
4.6.2. Static Asset Tag Sensitivity
By adjusting switch S9 it is possible to adjust the sensitivity of the reader to Static Asset Tag
movement. So that small movements by say for example the office cleaner will be ignored,
but deliberate attempts to move the asset will be detected. The reader processor resets a
sensitivity counter every 5 seconds, and the global "sensitivity" of all Static Tags is