Eurotherm 6100A, Руководство пользователя

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100/180 mm PAPERLESS GRAPHIC RECORDER: USER GUIDE
HA028910
Issue 13 Sep 16
User Guide
Page 286
8.2.4 SECURITY (Cont.)
TO SEND A LOGIN REQUEST (Cont.
)
Response
Figures 8.2.4c and 8.2.4d show response messages for successful and non-successful login attempts.
Figure 8.2.4c Response to a successful login attempt
Byte 0
Transaction
identifier
Transaction
identifier
Protocol
identifier
Protocol
identifier
Byte 1 Byte 2 Byte 3 Byte 4
Number of
bytes fol-
lowing (hex)
Byte 5
Always 00
Byte 6
Recorder
Modbus
address
Byte 7
Modbus
function
code (hex)
00 00 00 00 00 06 01
Byte 8
Start
Address
high
Byte 9 Byte 10 Byte 11
10
Start
Address
low
No. of regis-
ters high
No. of regis-
ters low
CC 30 00 05
Byte 0
Transaction
identifier
Transaction
identifier
Protocol
identifier
Protocol
identifier
Byte 1 Byte 2 Byte 3 Byte 4
Number of
bytes fol-
lowing (hex)
Byte 5
Always 00
Byte 6
Recorder
Modbus
address
Byte 7
Modbus
function
code+ MSB
set (hex)
00 00 00 00 00 04 01
Byte 8
Exception
code
90 02
Figure 8.2.4d Response after an unsuccessful login attempt
Note: MSB = Most Signifi cant Bit