Universal control card – Envirco Universal Control Card User Manual
Page 7
Part #: 265888
Universal Control Card
7
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A d v a n c e d Te c h n i c a l 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 DIP 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
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
To reset non-volatile registers to factory default values, write 170 (AA hex) to Register 14, and then cycle power.