Intermec IV7 Basic Reader Interface Programmer's Reference Manual (BRI version - Page 134
READGPI Command, TRIGGER Command, Antennas, ANTENNA Data Type Definition
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Chapter 5 - Reader-Specific Platform Specifications READGPI Command The READGPI command returns a value that indicates the current state of all the GP input lines available on a reader. For more information, see "READGPI" on page 60. Readers that contain the IM4 module have two GP input lines, which are numbered from 1 to 2. Each GP input line can be 0 (OFF) or 1 (ON). Interpreting the Value Returned by READGPI Value 0 1 2 3 Which GP Input Lines are Turned ON? 1 2 ON ON ON ON The response is formatted as follows for a reader that has two GP input lines, indicating that all input are ON: 3 OK> TRIGGER Command The TRIGGER command creates, deletes, and displays trigger events that are based on the state of the GP inputs supported by the reader. For more information, see "TRIGGER" on page 63. For readers that contain the IM4 module, the GPIO mask value can only contain values 0, 1, 2, or 3. Antennas Readers that contain the IM4 module have one antenna, and affects these programming elements: • ANTENNA data type definition • ANTENNA or ANTS attribute ANTENNA Data Type Definition The ANTENNA data type definition indicates which antenna primarily located the tag. ANTENNA is also a read-only value reported during the execution of READ and WRITE commands. For more information, see "ANTENNA" on page 22. For readers that contain the IM4 module, the ANTENNA data type definition always returns a value of 1. 122 Basic Reader Interface Programmer Reference Manual