ESD electronic CAN-CBM-PLC/331-1, Hardware Manual

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Commands and Parameters
esd Protocol for CAN Modules Rev. 3.2 3 - 24
Reply of the modules to the command 'request RxIds':
The reply of the Rx identifiers depends on the value of the received sub command.
The following table shows the information which the module transmits to the CAN.
Sub
command
Reply of the
parameter
Byte 1 Byte 2 Byte 3 Byte 4 Byte 5 Byte 6 Byte 7 Byte 8
$00 RxId 1 $03 $00 Rx1S Rx1E - -
$01 RxId 2 $03 $01 Rx2S Rx2E - -
$02 RxId 3 $03 $02 Rx3S Rx3E - -
: : $03 : : : - -
n RxId (n+1) $03 n Rx(n+1)S Rx(n+1)E - -
(-) Byte is not transmitted
Table 3.4.4:
Transmitting the actual Rx identifiers
Explanation of the bytes transmitted by the module:
Byte 1... The first byte returns the contents of the received command byte
(here always $03).
Byte 2... The second byte returns the contents of the received sub command byte. The sub command
designates the selected identifier.
Byte 3-
Byte 6...
In these cells the actual Rx identifier is returned. The bits of the identifier are described in
byte 3 and 4 (or byte 5 and 6) and returned in that form as they have to be entered at setting
in byte 5 and 6. (See also table 'Bits of the Rx identifier in byte 5 and 6'.)
Apart from the allocation of Rx identifiers described above there is the possibility to
allocate, depending on the module type, an own identifier to each output bit, byte or word
(see chapter 'Rx Block Mode'). If this block mode is activated, the first (Rxm_S) and the
last (Rxm_E) identifier of the block are returned at an RxId request command
(m=1,2,3,4...).
If the module is not in Rx block mode, the returned identifier in byte 3 and byte 4 is
identical with the one in byte 5 and byte 6.