Envirco MAC 10 LE-DC - Manual (Page 11)

MAC 10
®
LEDC
4x4 Fan Filter Unit
11 Innovators in Clean Air Technology | www.envirco.com | Operation & Maintenance
I n s t a l l a t i o n & S e r v i c e M a n u a l
COMMUNICATION SPECIFICATIONS
Overview:
• MODBUS RTU protocol over RS485 (serial)
• 9600 baud rate, word length is 8, parity is none(n), stop bits=1
• 255 unique address values selectable by S2 switch settings
(recommended network node capacity 200 nodes)
• Slew rate limited transceivers for improved network performance MODBUS Register Summary Table
• DO NOT USE CROSSOVER CABLES. THIS MAY DAMAGE THE CONTROL CARD OR RENDER IT NON-OPERATIONAL.
MODBUS Register Specifications:
Register Name R/W Values & Defaults Units Origin Comments
1 RUN/STOP RW 0,1 1 RAM power up from REG 14
2 DEMAND RW 0-100 % RAM power up from REG 10
6 SPEED R 0,5-2000 RPM LIVE
7 ANA1 R 0-1000 - LIVE Onboard Pot 0-1000=0-100%
9 STATUS R see detail - LIVE
10 DEFAULT SPEED RW 0-100 50 EEPROM applies to network only
12 CURRENT SPEED R 0-100 - LIVE
14 DEFAULT RUN/STOP RW 0,1 1 EEPROM applies in network mode only
24 ANA2 R 0-1000 - LIVE 0-10V input 0-1000=0-10VDC
To reset non-volatile registers to factory default values, write 170 (AA hex) to Register 14, and then cycle power.
Note: Register 24 may be read in network mode to determine the value of 0-10VDC signal that may be connected.
For example, a pressure transducer may be connected to indicate unit interal static pressure.