RTX-24EM-HP
User guide
The technical characteristics can change without notice. AUR°EL S.p.A doesn’t assume the responsibility to the damages caused by an improper use of the device.
AUR°EL S.p.A.
Via Foro dei Tigli, 4 - 47015 Modigliana (FC) – ITALY 12/11/2019 - Rev. A
Tel.: +390546941124 – Fax: +390546941660 Page 21
http://www.aurel.it
9.5
Channel Data Rate
The EM9209 has a programmable channel data rate of 1.5kbps to 72kbps for transmission and reception in
normal sensitivity mode.
The channel data rate is set by
R_Bit_Clk[8:0]
(
RAM2@12[8:0]
) and
Ch_Rate[2:0]
(
RAM2@12[11:9]
) as
shown in Table 8
.
The complete typical values
RAM2@12[11:0]
is also reported.
In high sensitivity mode, only the 4 slower data rates are available (
Ch_Rate[2:0]
= ‘000’ to ‘011’).
On air bit rate (kbps) Ch_Rate[2:0]
R_Bit_Clk[8:0]
RAM2@12[11:0]
1.5
000
110000000
0x180
2.99
001
011000000
0x2C0
6.02
010
001011111
0x45F
12.037
011
000101111
0x62F
24.074
100
000010111
0x817
48.15
101
000001011
0xA0B
72.22
110
000000111
0xC07
Table 8: Channel Data Rate
To establish a communication, both linked devices must be set to the same data rate.
9.5.1
Bit stuffing
To improve the receiver’s clock recovery, the data transmitted is automatically bit stuffed with a hardwired
algorithm. The internal bit stuffing procedure is allowing a maximum of 4 consecutive same symbols to be
transmitted. It corresponds to a minimum efficiency of 80%, or a minimum bit rate described by Table 9.
On air bit rate (kbps)
Minimum bit stuffed data rate (kbps)
1.5
1.2
3
2.4
6
4.8
12
9.6
24
19.2
48
38.4
72
57.6
Table 9: On air VS Minimum bit stuffed data rates
