User's Manual

Document : CS-SUP-MUTI-WPORTAPP-E02.sxw
5.3- ’Polling’ Mode
This mode allows to address a request to a list of predefined distant equipment. The response is sent to the
host, transmitter of the request, when all the distant equipments responded; or on timeout. Two types of
exchanges in polling mode can be distinguished,
 Not-selective Polling : all the distant equipments, configured in POLLING_ROUTE table, are
interrogated.
 Selective Polling : only a given group of distant equipments, configured in POLLING_ROUTE
table, are interrogated.
5.3.1 - Configuration of the parameters relating to the 'Polling' mode
The parameters are accessible by commands REQ_READ_RADIO_PARAM, and REQ_WRITE_RADIO_PARAM (all
the parameters are developed in appendix 3).
NUM DESCRIPTION VALUE
SIZE
(in bytes)
0x03
WAVECARD_POLLING_GROUP : Byte containing
the Polling Group of the Wavecard.
Byte 1 : Polling_Group
by default, Polling_Group = 0x00
1
0x08
POLLING_ROUTE : Table containing the list of
modules radio address to be addressed.
Byte 2 : number of equipments to interrogate
IF Byte 2 != 0
Bytes 3 to 8 : radio address of the first
module..., and so on.
1 à 241
0x09
GROUP_NUMBER : Byte containing the number of
the group of radio equipment to address in radio
polling mode.
Group number
by default, GROUP_NUMBER = 0x00
1
0x0A
POLLING_TIME : delay between two consecutive
emission in polling mode
Value in multiples of 100ms
By default, POLLING_TIME = 0x0A
1
Example of parameter setting: Writing of the list of the distant equipments, addressed by the
polling mode.
In our example, we have two distant pieces of equipment, whose addresses (on 6 bytes) are
0xAAAAAAAAAAAA; and 0xBBBBBBBBBBBB.
We launch a REQ_WRITE_RADIO_PARAM request, by positioning byte CMD with 0x40. Then, in the
DATA field, we specify the number of the parameter to be modified, and its corresponding data,
according to the following format.
DATA field
1 byte variable
Number of the parameter to modify Parameter data
Thus,
REQ_WRITE_RADIO_PARAM
Header CMD DATA CRC ETX
3 bytes 1 byte 1 byte variable 2 bytes 1 byte
0xFF ; 0x02 ; 0x11 0x40 0x08
0x02
0xAAAAAAAAAAAA;
0xBBBBBBBBBBBB
0xXXXX 0x03
WaveCard user handbook page 49 of 67