ThingMagic Sargas User Guide
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14 Sargas Specifications
The following are the specifications for the Sargas Reader
.
14.1 UHF RFID Antenna Interface
Interface
: Two RP-SMA Connectors
RF Power Output
: Separate read and write levels, adjustable from 0 dBm to 30.0 dBm*
(1.0 W)
Frequency
: Hop table with up to 62 entries, configurable in 50KHz steps, accommodating
the following
ranges (hardware dependent):
– 902-928 MHz (FCC; NA, SA)
– 865.6-867.6 MHz (ETSI; EU)
– 865-867 MHz (MCIT; India)
14.2 Power
If designing a power source for the Sargas reader, you should use the worst-case maximum power
consumption figures. If estimating battery life for a power source connected to the Sargas reader, you may
use the typical figures. Both are provided below. Note that external devices connected to the Sargas
reader can impact the power consumption
External DC Power
: 5 VDC +/- 0.25V supply voltage. Maximum DC power under all worst
case
conditions: 15 W. This is based on 10 W being consumed by the Sargas reader itself and 5 W being
supplied to external peripherals that are connected to the Sargas reader. It is recommended that DC
supplies connected to the Sargas reader be capable of supplying 15W at 5V to avoid a brown-out
condition under any circumstances.
Neglecting external peripheral circuitry being powered by the Sargas reader, typical DC power
consumption when transmitting at +30 dBm is 7.3 W into an approved antenna. Typical power
consumption when the reader is idle is 1.7 W.
If power is being drawn from the host USB port, you must add as much as 2.5 W to the typical power
consumption when transmitting or at idle. If power is being supplied by the 5V GPIO power source, you
must also add as much as 2.5 W to the typical power consumption to account for this. Therefore, the
typical power consumption when
transmitting will vary between 7.3 and 12.3 W depending on how the
Sargas reader is used. Similarly, typical power consumption when idle can vary from 1.7 to 6.7 W.
Note:
If a third-party DC Power supply is used it must meet the following criteria:
Be UL Listed
Meet the above operating specs
The output must comply with SELV and LPS characteristics
