Biomark IS1001 Operation User's Manual page 16

Installing and Configuring IS1001 Reader
9. IS1001 Synchronization Mode default setting is Secondary Master.
IS1001 reader that is set as Secondary Master will assume the Master role and will enable its
own antenna exciter oscillator if it did not detect the presence of synchronization signal on the
synchronization network, otherwise it will operate as a Slave and will use antenna exciter
oscillator signals received through the synchronization network.
When multiple Secondary Masters are present on the network, the delay, which is tied to
reader ID, is used to determine which one becomes the Master when synchronization input
signal is not present, i.e. IS1001 reader with lowest reader ID number will be the first to enable
its antenna exciter oscillator. The delays is calculated by multiplying reader ID by 50
milliseconds, if HDX detection is enabled the delay is increased by 25 milliseconds (50 - 12750
milliseconds when HDX is disabled or 75 - 12775 milliseconds when HDX is enabled).
To maintain the presence of a sole source of synchronization signal on the network, the
presently active Secondary Master will occasionally disable its exciter oscillator (for up to 60
microseconds) and check for the presence of synchronization input signal:
•
Periodic verification is performed every hour.
•
Conditional (off-schedule) verification is performed if noise level exceeds High Noise
alarm threshold. If the synchronization input signal is not detected, but high noise level
persists, the verification will be repeated in 5 minutes.
•
Conditional (off-schedule) verification is performed if antenna tuning capacitors are
being adjusted more than twice per second. If the synchronization input signal is not
detected, but sporadic tuning activity continues, the verification will be repeated in 5
minutes.
If the synchronization input signal is detected the Secondary Master will revert to being a
Slave.
Secondary Master option provides assurance that the site will remain operational in case the
Master reader becomes inactive or fails.
10. If you wish to have a certain IS1001 reader to always act as a Master and the rest as Slaves,
so that you can activate or deactivate the entire site by activating or deactivating the Master
IS1001 reader, then configure that IS1001 reader as the Master by using the RSM1 and
configure the remaining IS1001 readers as Slaves by using the RSM3 command (see page
28).
The following figure shows two IS1001 readers wired for antenna exciter oscillators
synchronization.
12 IS1001 Reader User Manual