6
Modbus Module User Guide
www.controltechniques.com
Issue 1
3.3
Network Status LED
The Network Status LED (1) indicates the state of the communications link between the module and the network. LED operation is as
follows:
Figure 3-3 Feedback LEDs
03193.
C
1
Off
No connection or soft starter not powered up
On
Communication active
Flashing
Communication inactive
NOTE
If communication is inactive, the soft starter may trip if the Communications Timeout function has been set on the module.
When communication is restored, the soft starter will require a Reset.
4.
Master Configuration
For standard Modbus 11-bit transmission, the Master must be configured for 2 stop bits with No Parity and 1 stop bit for odd or even
parity.
For 10-bit transmission, the Master must be configured for 1 stop bit.
In all cases, the Master baud rate and slave address must match those set on the Modbus Module DIP switches.
5.
Modbus Functions
The Modbus Module supports the following Modbus functions:
•
03 Read multiple registers
•
06 Write single register
Modbus broadcast functions are not supported.
Digistart CS soft starters (including Remote Keypad):
•
Read multiple registers 40003 to 40008
•
Write single register 40002
Digistart IS soft starters:
•
Read multiple registers starting from 40003 up to a maximum of 119 register blocks.
•
Write single register 40002 or 40009 to 40599.
NOTE
A multiple read across register boundary 40008/40009 will result in a Modbus Error code 05 at the Master.
