Novatek-electro OM-310, Руководство пользователя

Страница: 19 / 29

- 19 -
NOVATEK-ELECTRO
ОМ-310
Table 2.3
Settings and read-off parameters Code parameters Address
Equipment operation time counter, days

207
User access code

208
Service engineer access code

209
System reset to factory settings

210
Device version

217
A parameter recording is performed independently from the installed Service Engineer protection (the entry
made via communication line has a higher priority).
When a new parameter value is recorded into a MMSP- protected cell, such parameter will automatically be ex-
cluded from this mode.
Recorded parameters must be aliquot to iteration specified in Table 1.5.
For example, record 1000 (0x03E8) to register w
ith 0x00A0 address into ОМ
-310 with 01H communication ad-
dress.
Table 2.4
Command message Response message
ADR 0x01 ADR 0x01
CMD 0x06 CMD 0x06
Start data address 0x00
0xA0 Start data address 0x00
0xA0
Data 0x03
0xE8 Data 0x03
0xE8
CRC CHK low 0x89 CRC CHK low 0x89
CRC CHK high 0x56 CRC CHK high 0x56
Command code 08h – diagnostics.
08h function provides a number of tests for checking communication system between PC and OM-310, and for
OM-310 integrity control.
The function uses the sub function field to specify the action performed (test).
Sub function 00h – query data return.
Data transferred in the query field must return in the response data field.
Request and response example is given in Fig. 2.3.
Figure 2.3 - Example of sub function request and return 00h – data request return.
01h sub function – communication options restart
ОМ
-310 peripheral port shall be initialized and restarted.
Request and response example is given in Fig. 2.4.
Figure 2.4 - Example of sub function request and return 01h – communication options restart.
2.4.4.5 CRC - Cyclic redundancy check code
The checksum (CRC16) is a cyclic redundancy check code based on A001h polynomial. The transmitting de-
vice forms the checksum for all bytes of the message transmitted. The receiving device similarly forms the check-
sum for all bytes of the message received, and compares it to the checksum received form the transmission device.
When received and transmitted checksums do not match, an error message is generated.