ComAp InteliLite NT AMF Series - Remote Control and Data Logging; PC Connection and Software; Modbus Communication Protocol

InteliLite
NT
– AMF20/25, SW version 1.2, ©ComAp – March 2008 73
IL-NT-AMF-Reference Guide1.2.pdf
Remote Control and Data Logging
Direct connection to the PC
InteliLite can be connected directly with PC via optional IL-NT RS232 interface.
Use the standard serial cable to connect PC with InteliLite.
Hint:
Make sure the grounding system on controller and PC – COM port (negative of the PC DC supply) are
identical – before the first direct connection. There must not be any voltage between these two points
otherwise the internal reversible fuse in controller burns out. The simple solution is to assure, that the
PC supply 240/20V is ground free (GND terminal is not connected).
5 - GND
2 - RxD
3 - TxD
PC
5 - GND
2 - RxD
3 - TxD
RS232
RS232
230 VAC
0 VDC
CONTROLLER
+
-
Battery
Required the same
voltage potential
between GND‘s
RS 232
PC software – LiteEdit
On the PC (for direct or modem connection) has to be installed the ComAp’s software package
LiteEdit. (based on Windows 95 or newer platform)
LiteEdit enables:
• read the quantities
• adjust all set points
• control the engine
• configure the controller
• select software configuration
• modify alarm inputs and outputs
• modify password, commands protections
• direct, modem or Internet communication
Modbus protocol
The selection of the function of iL serial port is done via the setpoint
RS232 mode in Basic settings
•
9600 bps, 8 data bits, 1 stop bit, no parity
• Transfer mode RTU
• Function 3 (Read Multiply Registers)
• Function 6 (Write Single Register)
• Function 16 (Write Multiply Registers)
• The response to an incoming message is sent with minimum 4.096 ms delay after message
reception
The complete description of Modbus communication protocol can be found in
Modbus Protocol
Reference Guide PI-MBUS-300
and Open Modbus Specification Release 1.0. Both documents are
available from web site at http://www.modicon.com/openmbus/
.