GE ASTAT XT QT 0008U Series User Manual page 90

Parameter
Last Fault
Motor FLT Current
Reserved
Thermal Capacity
Reserved
Actual_Data_Group
Example 1:
To read actual parameters 2 and 3 (Motor Current and Mains Voltage Actual Parameters, Addressed as 1 and 2) of
ASTAT-XT # 18 (its SERIAL LINK NO. = 18), the host computer should send following frame:
byte 1: Serial Link No.
byte 2: Function
byte 3: Starting Address High
byte 4: Starting Address Low
byte 5: No. of Points High
byte 6: No. of Points Low
byte 7: CRC_Low
byte 8: CRC_High
The ASTAT-XT response, when Current = 400 % of Im, and Voltage = 420V, is:
byte 1:Serial Link No.
byte 2: Function
byte 3: Byte Count
byte 4: Data High, parameter 2
byte 5: Data Low, parameter 2
byte 6: Data High, parameter 3
byte 7: Data Low, parameter 3
byte 8: CRC_Low
byte 9: CRC_High
Note:
$XX indicates Hexadecimal byte.
• Appendix A - MODBUS RTU Protocol
90
# (3x) # (4x)
24 280
25 281
26..36 282..292
37 293
38..108 293..364
109..128 365..384
($12)
($04)
($00)
($01)
($00)
($02)
($XX)
($XX)
($12)
($04)
($04)
($01)
($90)
($01)
($A4)
($XX)
($XX)
Comment
# of the fault that caused trip.
# Fault
01 Over Temperature
02 Short Cir. Curr.
03 Overload
04 Under Current
05 Under Voltage
06 Over Voltage
07 Phase Loss
08 Phase Sequence
09 Shorted Scr
10 Long Start Time
11 Slow Speed Time
12 Wrong Connection
13 External Fault
14 Wrong Parameters
15 EMI/RFI Fault
16 Too Many Starts
17 Reserved
18 Thermistor.
19 Frequency
Current at trip time, % of Im.
Group of 20 actual parameters selected by
parameter settings 90..109
Another Possibility
(Modbus Plus users)
($00)
($02)
(400) ($01)
($90)
(420) ($01)
($12)
($03)
($01)
($01)
($XX)
($XX)
($12)
($03)
($04)
($A4)
($XX)
($XX)