Unit installation

MAC 10

LEDC

4x4 Fan Filter Unit

11Innovators in Clean Air Technology | www.envirco.com | Operation & Maintenance

Installation & Service Manual

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 Specications:

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.