Ethos v1.5.7 and X18, X20 series User Manual
Internal Module TD-ISRM Pro (X20 Pro/R/RS)
For the TD ISRM RF module please refer to the Internal module TD-ISRM section.
Overview
The TD-ISRM Pro RF board offers triple RF path redundancy utilizing 2.4G FSK, 2.4G
Lora, and 900M (Lora), which breaks new ground in RF performance.
There are three separate shielded RF sections on the one ISRM board:
• The TWIN RF section has 2.4G FSK and 2.4G Lora capability.
• The 2.4G ACCESS RF section supports ACCESS and ACCST D16, and is also used
for Tandem.
• The 900M ACCESS RF section is also used for Tandem, as well as providing
redundancy for other receivers.
With three RF sections there are many different modes and configurations that can be
selected.
Attention! In this manual and the radio menus ‘900M’ is a generic term denoting the
VHF band used. The actual operating frequencies are 915Mhz for FCC or 868Mhz for LBT
as applicable to the user’s country of operation.
TD-ISRM Pro modes
ACCESS/ACCST D16
In ACCESS mode the 2.4G and 900M RF paths work in tandem with one set of
ACCESS controls. There can be three 2.4G receivers registered and bound or three
900M receivers registered and bound or a combination of 2.4G and 900M for a total
of three receivers.
In ACCESS mode with a combination of 2.4G and 900M receivers the telemetry for
the 2.4G and 900M RF links are active at the same time. The sensors are identified
in telemetry as 2.4G or 900M. Please note that the 2.4G band supports 24
channels, while the 900M band supports 16 channels.
The ACCST option offers ACCST D16 with a 900M receiver option for redundancy.
Refer to the ACCESS/ACCST D16 section below.
TD Tandem Dual Band 2.4G/900M
In TD Mode the RF module is in a low latency long range mode using the 2.4G and
900M RF links in Tandem to work with up to three Tandem receivers. Tandem
supports 24 channels on both bands.
This mode is similar to the TD Mode in the X20. Please refer to the TD Mode section
for setup details.
TW 2.4G TWIN/900M.
In TW mode there is one 2.4G FSK and one 2.4G LoRA RF link for use with up to
three TWIN receivers. There is a 900M receiver option for redundancy, via the SBUS
IN/OUT ports. This further enhances the RF signal's reliability, particularly in
scenarios involving long-distance RC operations.
Refer to the TW Mode section below.
TD-Pro
For use with future FrSky TD-Pro receivers.
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