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ARF868 Radio Modems- Guide utilisateur / User guide version V2.2.2
Note5 : registers S217 and S218 are used to synchronise transmission start:
•
either a timeout (S217)
•
or a quantity of data in the buffer memory (S218)
The first of these two limits reached triggers transmission start.
When the number of octets in the buffer memory reaches the threshold of register S218 before the timeout of register S217, it is triggering on
data.
On the other hand, when the timeout of register S217 expires before the data in the buffer memory reach the threshold of register S218, it is
triggering on time.
It should be noted that programming register S217 to 0 (no timeout) means that the S218 register threshold must be reached to start transmis-
sion.
Below example of S217 & S218 register usage :
TX RF via S218
1
2
3
4
5
Millisecondes
1
2
3
4
5
Millisecondes
1
2
3
4
5
Millisecondes
5.4. Configuration coherency
The ARF868 modem contains monitoring of the configuration coherency and prevents saving and operation of invalid parameters.
Radio parameter coherency
Radio power, radio data rate and frequency parameters should correspond to valid combinations presented in the table below (cf Appendices)
and in more detail in the document entitled: "ARF868 Modem channels list" available on the adeunis® website.
Protocol parameter coherency
The following parameters should be set according to the combinations shown in the table below:
Register
S222
S254
S204
All other combinations of these registers except those described in the table above are invalid.
Invalid combinations result in the return of a "W" on the AT&W and ATO commands which are not executed in this case.
6
7
8
9 10 11 12 13 14 15 16 17
6
7
8
9 10 11 12 13 14 15 16 17
TX RF via S218
6
7
8
9 10 11 12 13 14 15 16 17
Legacy X3-PRO Mode
11 ; 12
0 or ajustable on demand
TX RF via S217
Continuous Asynchronous Protocol
4
S217 = 10 millisecondes
S218 = 3 octets
Condition 3 octets remplie = émission
S217 = 10 millisecondes
S218 = 3 octets
Condition 10 millisecondes sans nouvel
octet remplie = émission
S217 = 10 millisecondes
S218 = 3 octets
Condition 3 octets remplie avant
échéance timeout 10 millisecondes = émission
3
1 ; 3 ; 6 ; 8
0
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