Programming Guide

CHUMP Reference Guide
2
RFID Reader Programming Overview
SAMSys RFID readers are programmed and configured using a
human-readable variation of the High-Level Data Link Control
(HDLC) protocol. These commands are called the
Comprehensive Heuristic Unified Messaging Protocol
(CHUMP). CHUMP commands are issued to select reader
operating modes as well as initiate specific actions.
Reader Operating Modes
SAMSys RFID readers are extremely flexible and easily
programmed to function in several modes. These modes define
the readers RF and serial communication characteristics. The RF
modes are as follows:
• RF Continuous
• RF Polled
In RF Continuous mode, the reader periodically scans for tags
over the air interface. In this mode, the reader does not require an
external event or command to read a tag. A reader in RF
Continuous mode is referred to as an active reader.
In RF Polled mode, the reader scans for tags only after the host
sends a read command. In this mode, the reader remains idle until
an external event initiates the read function. A reader in RF
Polled mode is referred to as a passive reader.
In RF Continuous mode, SAMSys readers can further be
programmed to operate in different serial communication modes.
The serial communication modes are as follows:
• Serial Continuous
• Serial Polled