Lust CM-CAN1 - Reading string parameters

User Manual CM-CAN1
4-15
4 Setting the device parameters
DE
EN
1
2
3
4
5
6
7
A
PARA_LO: Parameter number Low byte
PARA_HI: Parameter number High byte
DATA: 32-bit data
(at “List-End” : Checksum)
COUNTER: Block counter for data lengths > 4 bytes, such as
string parameters (incremented on every transfer).
Data direction: Drive unit -> Master
PARA_LO: Parameter number Low byte
PARA_HI: Parameter number High byte
DATA: 32-bit data (at “List-End” : Checksum)
COUNTER: Block counter for data lengths > 4 bytes, such as
string parameters (incremented on every transfer).
4.6.1 Reading string
parameters
The master registers in data byte 2 (transfer mode = 11) that it wants to
read a string parameter. The contents of data bytes 3-6 are not relevant.
The block counter (data byte 7) contains the value 0. The reply telegram
from the drive unit contains the status byte and gives information on the
readability of the parameter. If the parameter is readable, the first reply
telegram contains the first four characters.
Data bytes 3 - 6 are transmitted in Intel format:
Byte 3 = Low Word Low Byte
Byte 4 = Low Word High Byte
Byte 5 = High Word Low Byte
Byte 6 = High Word High Byte
Priority
based on
CAL
Base
ID
Data byte
0
Data byte
1
Data byte
2
Data byte
3+4+5+6
Data byte
7
6 1321
PARA_LO PARA_HI
STATUS
0 = Transfer OK
DATA
Counter or Index for
field parameters
Function of bits:
0 = Vacant
1 = SIO watchdog
2 = Transfer mode
unknown
3 = Read not permitted
4 = Repeat action
5 = Parameter unknown
6 = Change not permitted
7 = Impermissible value