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Application Note 1005
AirCare VariPhaseTM MODBUS - Protocol Communication Guideline and Register Definition
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Overview
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- MODBUS RTU protocol
- Selectable Physical medium
- RS422 (4-wire)
- RS485 (2-wire)
- Selectable baud rate - 1200 or 9600, 8, n, 1
- Two network wiring methods
- Dual RJ-45 sockets (2 and 4 wire)
- Screw Terminals (2 wire only)
- Up to 127 unique addresses selectable by DIP switch settings
- Slew rate limited for improved performance
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Register Descriptions
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| Register |
Upper Byte |
Lower Byte |
Commands |
Type |
| 1 |
|
Bit 0: Start/Stop |
03, 06, 08 |
R/W |
| 2 |
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Motor Speed (0-100%) |
03, 06, 08 |
R/W |
| 3 |
P Value |
03, 06, 08 |
R/W |
| 4 |
1 Value |
03, 06, 08 |
R/W |
| 5 |
D Value |
03, 06, 08 |
R/W |
| 6 |
Motor Speed (RPM) |
03 |
R |
| 7 |
Analog Input (0-1023) |
03 |
R |
| 8 |
Minimum Speed Pot (0-1023) |
03 |
R |
| 9 |
Configuration Jumpers |
03 |
R |
| 10 |
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Default Speed (0-100%) |
06 |
R/W |
| 11 |
Version Major |
Version Minor |
03 |
R |
| 12 |
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Triac Phase Angle (0-100) |
03 |
R |
| 13 |
Max Speed (750-3600rpm) |
03,06,08 |
R/W |
| 14 |
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Bit 0: Default Start/Stop |
06 |
R/W |
| 15 |
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Group 1 Address |
06 |
R/W |
| 16 |
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Group 2 Address |
06 |
R/W |
| 17 |
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Number of Good Packets |
03,06,08 |
R/W |
| 18 |
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Number of Bad Packets |
03,06,08 |
R/W |
| 19 |
Triac off Period |
06 |
R/W |
| 20 |
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PID Interval |
03,06.08 |
R/W |
| 21 |
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Tach Filter |
03,06.08 |
R/W |
| 22 |
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Compensation Table |
03,06.08 |
R/W |
| 100 |
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Product ID |
03 |
R |
Table 1
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Key
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Network Signal Descriptions
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RS485
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Description
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AirCare
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MODBUS
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EIA485
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| Non-Inverting |
+ |
D0 |
A |
| Inverting |
- |
D1 |
B |
Table 2
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RS422
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Description
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AirCare
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MODBUS
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EIA485
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Transmit
Non-Inverting |
TX+ |
TXD0 |
A |
Transmit
Inverting |
TX- |
TXD1 |
B |
Receive
Non-Inverting |
RX+ |
TXD0 |
A' |
Receive
Inverting |
RX- |
TXD1 |
B' |
Table 3
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RJ45 Network Cable Connections
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1
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2
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3
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4
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5
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6
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7
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8
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Bus Power Pass Through
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0V(GND)
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RS485
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0V(GND)
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Bus Power Pass Through
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| + |
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- |
| RS422 |
| TX+ |
RX- |
RX+ |
TX- |
Table 4
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