A P P E N D I X
A
SMR-650 Reader Specifications
28
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, dev/- 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)
