RFDesign RFD868x - Page 11

Point-to-Point/SIK Firmware User Manual
www.rfdesign.com.au
12
Last update 17/12/2020
Reg
#
S Register
Description
Default
Value
Maximum
Value
Minimum
Value
Must be the same
at both ends of
the link?
S20
ANT_MODE
0= Diversity, 1= Antenna 1 only, 2=
Antenna 2 only, 3= Antenna 1 TX and
antenna 2 RX
0
3
0
No
S21
GPIO1.3 Status LED output
9
Set GPIO 1.3 (pin 12 x/NA ux/24 ux-SMT)
as output with state that mirrors the
status LED on the modem
0
1
0
No
S22
GPIO1.0 485 TX control output
6
Set GPIO 1.0 (pin 13 x/NA ux/21 ux-SMT)
as control signal on DINIO and RS485
interface boards.
0
1
0
No
S23
Rate and Frequency Band
Switches between valid settings for the
frequencies, channels and airspeeds that
can be set on compliant modems
ensuring compliance is maintained. See
section 3.4 for FCC-related information.
0
3
0
Yes
S24
GPIO1_2AUXIN
12,13
Set GPIO 1.2 (pin 14 x/NA ux/23 ux-SMT)
Auxiliary Serial Input (RX)
0
1
0
No
S25
GPIO_1.3AUXOUT
12,13
Set GPIO 1.3 (pin 12 x/NA ux/24 ux-SMT)
Auxiliary Serial Output (TX)
0
1
0
No
S26
Reserved
5,12
N/A
N/A
N/A
N/A
S27
Reserved
5,12
N/A
N/A
N/A
N/A
S28
FSFRAMELOSS
12
Set number of missing frames to trigger
frame time out for SBUS signals
50
5
50
No
R0
TARGET_RSSI
Optimal RSSI value to try to sustain
(255/0
8
disables the feature) V3.09 and
earlier this is based on RSSI figures. After
v3.12 this changes to being based on
receiver dBm
255/0
8
255/110
8
50/0
8
No
R1
HYSTERESIS_RSSI
Amount of change before power levels
altered. V3.09 and earlier this is based
on RSSI figures. After v3.12 this changes
to being based on receiver dBm
50/5
8
50/15
8
20/2
8
No
Table 4-3: x and ux series parameters
Notes:
1
The listed values are the full range of options available on unrestricted modems. The range of settings available may be altered on
compliant systems to maintain compliance to the appropriate standards
2
ECC - Software Detection and correction, extra packet information, twice the packet length, is sent to allow the recovery of corrupted
packets. Disabled in version 3.15 and up. Error detection is handled by CRC since at least version 3.01 and may cause data errors.
3
Injects RSSI packet when MAVLink protocol used and heartbeat packet detected.