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Appendix A - MODBUS RTU Protocol
byte 3: Coil Address High
($00)
byte 4: Coils address Low
($02)
byte 5: No. of Coils High
($00)
byte 6: No. of coils Low
($03)
byte 7: Byte Count
($01)
byte 8: Force Data
($07)
byte 9: CRC_Low
($XX)
byte 10: CRC_High
($XX)
The Normal (if no exception) response is the echo of the Query:
byte 1: Serial Link No.
($20)
byte 2: Function
($0F)
byte 3: Coil Address High
($00)
byte 4: Coils address Low
($02)
byte 5: No. of Coils High
($00)
byte 6: No. of coils Low
($03)
byte 7: CRC_Low
($XX)
byte 8: CRC_High
($XX)
A.11.
Discrete Hardwired Inputs (1x References)
The ASTAT-XT incorporates 16 Discrete Inputs, (bit parameters), from which only 6 are operative. The other 10 are
reserved and were incorporated to enable use of word (16 bits) type parameters. Input # is "1 based". The actual
address is 1 lower than input #. For example input #1 is addressed as 0 (10000). The inputs have the following 1x
references:
Input #
Address
ASTAT-XT use Comment
1
0
Stop
Open Input (Input reads" 0") to Stop. (Terminal # 4)
Close Input (Input reads "1") to enable Start / Run.
2
1
Soft Stop
Open Input (Input reads"0") to Soft Stop.
(Terminal # 5)
Close Input (Input reads"1") to enable Start / Run.
3 2 Start
Close
Input
(Input
reads "1") to Start. (Terminal # 6)
4
3
Energy Save *
(Terminal # 7)
Slow Speed *
Reset *
Close Input (Input reads "1") to turn On.
Open Input (Input reads "0") to turn Off.
5
4
Dual Adjust *
(Terminal # 8)
S. Spd Rvrs *
Reset *
Close Input (Input reads "1") to turn On.
Open Input (Input reads "0") to turn Off.
6..7
5 Reserved
8
7
External Fault Open Input = no fault (Input reads" 0") (Terminal #19)
indicates No Fault Condition.
9..16
8..15 Reserved
* Programmable inputs.
