User's Manual

Reader Configuration
49
Using CHUMP Commands to Configure the Reader
In addition to using RF Command Suite to reconfigure a reader, individual
CHUMP commands can be sent to the reader from RF Command Suite or a
terminal/command console. To setup a SAMSys reader, the Configuration Write
(Cw) command is used to write a three-letter configuration variable name and a
32-bit word to the reader. This word contains the individual setup parameters
required by the reader.
For specific syntax information on the Cw command, refer to Chapter 2 in the
Comprehensive Heuristic Unified Messaging Protocol Reference Guide.
Commonly used configuration variables include the following:
• GCW – General Configuration Word
• SCW – Serial Configuration Word (CHUMP 1.31 and above)
• MCW – Multiplexer Configuration Word
• SMA – Serial Multidrop Address
• PCW – Protocol Configuration Word
• PSW – Protocol Select Word
• Pxx – Specific Protocol Configurations
• CNR - Self Training Control
The following example shows the Cw command used to write the MCW to the
reader.
}Cw,d:MCW,b:00040200! <CRLF>
where:
00040200 = 4 antennas, 2 inventory round operations
per antenna.
If the Cw command was successful, the reader responds with:
{A7; <FCS><CRLF>
Warning
The SAMSys MP9320 Reader uses internal registers to provide a high degree of flexibility
in setting operational parameters. The use of these registers is described in the MP9320
User’s Guide, the MP9320 Field Installation Guide, and the Comprehensive Heuristic
Unified Messaging Protocol (CHUMP) Reference Guide. However, improper setting of
these registers can result in reader inoperability or permanent damage.
In particular, the TPC, TP0, TP1, TP2 and TP3 registers control the transmit power of the
reader. The user should not modify these registers unless specifically directed by SAMSys
personnel. Trained, professional installers should only modify them as part of the transmit
calibration procedure described in the Field Installation Guide.