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Notes:
1.
The Read function of the control register is not possible. To read the ASTAT-XT status, read the Logic_Status
(Actual parameter # 1).
2.
Bytes 2..8 of the control frame must be exactly as in the following example. Otherwise an error message is
returned.
3.
Hardwired Stop and Soft Stop inputs override the communication. To enable motor starting through
communication, terminals 4 and 5 (Stop & Soft stop) must be connected to the control voltage.
Example 5 - Control Register Write:
To start ASTAT-XT # 11, the host computer sends the following Query frame:
byte 1: Serial Link No.
byte 2: Function
byte 3: Starting Address High ($02)
byte 4: Starting Address Low ($F0)
byte 5: No. of Registers High
byte 6: No. of Registers Low
byte 7: Byte Count
byte 8: Data High
byte 9: Data Low
byte 10: CRC_Low
byte 11: CRC_High
The ASTAT-XT Normal response:
byte 1: Serial Link No.
byte 2: Function
byte 3: Starting Address High ($02)
byte 4: Starting Address Low ($F0)
byte 5: No. of Registers High
byte 6: No. of Registers Low
byte 7: CRC_Low
byte 8: CRC_High
A.10.
Discrete Commands (Coils, 0x References)
The ASTAT-XT incorporates 16 "Coils", (bit parameters), of which only 5 are operative. The other 10 are reserved and
were incorporated to enable the user to use word (16 bits) type parameters. Coil # is 1"1 based". The actual address
is 1 lower than coil #. For example coil #1 is addressed as 0 (00000). The coils have the following 0x references:
Coil # Coil Address
1
0
2
1
3
2
4
3
5
4
6
5
7
6
8
7
9..16
8..15
Example 6 - Read Coils:
To read coils 1..8 status of ASTAT-XT # 10, the host computer sends the following Query frame:
byte 1: Serial Link No.
byte 2: Function
byte 3: Starting Address High
• Appendix A - MODBUS RTU Protocol
95
($0B)
($10)
Bytes 2..8 must be as in this example!!!
($00)
($01)
($02)
($5A)
($04)
Bit 2 is set, to start.
($XX)
($XX)
($0B)
($10)
($00)
($01)
($XX)
($XX)
Use in ASTAT-XT
Stop
Soft Stop
Start
Energy Save
Dual Adjust
Slow Speed
Slow Spd Reverse
Reset
Reserved
($0A)
($01)
($00)
Comment
Write "1" (ON) to stop.
Write "1" (ON) to Soft Stop
Write "1" (ON) to start
Write "1" (ON) to turn On. Write "0" (OFF) to turn Off.
Write "1" (ON) to turn On. Write "0" (OFF) to turn Off.
Write "1" for Slow Speed. Write "0" for Normal Start.
Write "1: for Reverse Direction. Write "0" for Forward Direction
Write "1" (ON) to Reset.
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