TransCore AI1401, User Manual

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AI1401 Reader Interface Capabilities
3-5
Figure 3-3 illustrates the pin-outs for the I/O interface DB9 connector.
Figure 3-3 I/O Interface DB9 Connector Pin-out
The output signals on the I/O interface DB9 connector indicate operation status of the
AI1401 Reader. These signals can be used to operate LED devices. The AI1401
Reader supports the following signals.
Power (PWR)
The power signal lights when power is applied to the reader unit via the user's RF
actuator switch (trigger). To begin communicating with the reader, you must send a
command within 10 seconds of triggering the device. Commands are discussed in
Chapter 4 of this guide.
After initial power-up, the AI1401 Reader remains on if there is any RS
–
232C port
activity. Reader power turns off after 10 seconds of inactivity from either the actuator
switch or the RS
–
232C port. The 10-second power off time-out is a factory default
value. The user can change the time-out to one minute using the !751 command.
Battery (BATT)
The battery signal is active when the main battery voltage drops below the preset level
(usually about 12.5 volts).
If the battery voltage drops below a second preset level (usually about 11.5 volts), the
microcontroller halts reader functions to prevent improper operation.
Buffer (BUFF)
The buffer signal is active whenever valid data is stored in the data buffer.
Transmitting data to a host computer will not erase it from the data buffer. Command
!73 clears the buffer contents and turns off the buffer LED.
Error (ERR)
The error signal is active when the tag just read contains a parity error.
Lock (LOCK)
The lock signal is active briefly when a valid tag has been decoded.
After the successful acquisition of a tag that meets uniqueness criteria, the RF source
turns off.