User's Manual

APPENDIX A SMR-650 Reader Specifications
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RF receiver/
transmitter
Ultra High Frequency (UHF) receiver and transmitter
(downlink and uplink):
Frequency: 433.92 MHz
Range: UHF read/write (symmetrical) range of up to 200
feet (61 m) line of site to SaviTag ST-6XX series and SaviTag
ST-41X series
Modulation: Frequency shift keying, deviation +/- 50 KHz
Data rate: 27.8 Kps, 50% duty cycle
Air protocol: Batch Collection System (BCS) and Extended
Batch Collection System (EBCS) commands; Savi EchoPoint™
Air Protocol 2.1 (two-way UHF commands and seal
extension commands)
Data coding: Manchester
Rx Signal Strength Indicator (RSSI): RSSI logic enables
software to implement a search function that can poll a tag
within range to determine tag proximity
RF communication: Yellow LED flashes to indicate receipt of
valid packet
Maximum transmit power: 0.6mW
Security: Password-protected communication with SaviTag
ST-6XX series
Error detection: 16-bit CRC
Wakeup signal: 31.25 KHz
LF transmitter for tag
commissioning
Low Frequency Transmitter (downlink):
Frequency: 123 KHz
Range: Up to 3 feet (.91 m) with SaviTag ST-6XX series
Modulation: Amplitude shift keying (on-off)
Data rate: 1.6 Kps, 50% duty cycle
Air protocol: Savi EchoPoint Air Protocol 1.1
Data coding: Pulse Code Modulation
Error detection: 8-bit CRC
Network Interface: Interface back to network requires mobile
computer to be enabled with wireless or wired docking
station
Protocol: Universal Data Appliance Protocol (UDAP) used to
communicate with Savi SmartChain Site Manager
Memory On board non-volatile memory of 256 KB for tag data (up to
500 records)