Installation Manual

15
Setting Digital Input for Reader Duty Cycle Control
MP9320 readers with software version 1.33.04 or later can be configured for limited
duty cycle (trigger enabled RF output) by setting one of the digital inputs. This
functionality can be enabled to meet regulatory requirements or to set the reader to
respond to external events.
In order for the reader to recognize the external event, the Protocol Control Word
(PCW) must be configured. Perform the following to setup the reader for external
trigger:
1. Place the reader into one of the following automatic modes:
• Field Off between reads: }Cw,d:GCW,b:03,f:01!
• Field On between reads: }Cw,d:GCW,b:03,f:01!
2. Set PCW bit 13 (mask 0x2000). Typically, the PCW is set to 0x100 to enable the
tag activity buzzer. As a result, a typical setup command is as follows:
}Cw,d:PCW,b:2100,f:01!
3. The reader should now be in limited duty cycle mode.
4. Apply +5-24 Vdc to Digital Input Common pin “N”.
5. To trigger a read, apply 0 Vdc to digital input 1. As shown in the previous table
and in Figure7, digital input 1 is pin “a” on the Main I/O connector.
Figure 7–Main I/O Connector
6. At this point, the reader should only radiate RF energy when digital input 1 is
pulled low (0 Vdc). Otherwise, the reader’s RF field shuts down.
7. For more information on reader configuration and control settings, refer to the
Comprehensive Heuristic Unified Messaging Protocol Reference Guide.