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www.elspec-ltd.com | December 2014 | SMX-0609-0101
User Manual | EQ-ST | V15
Figure 106: LED Tester
As mentioned before, each controller port has the capacity of up to six capacitors groups. In the picture
three lines of red LEDs, L1, L2 and L3 each for a different phase. On each line there re six LEDs, one per group. The
first group is on the left side of the picture.
When the LED tester is connected directly to the controller the same firing signal per group should appear on
both of them. This can be done only by previously disabling E3 error in the controller.
If the LED tester is connected to one switch module output channel (or port) , one must take into account how
many groups are present in this module (number of groups in the system) and the switch module position in the
system, because the system signaling interface of each switch module shifts its output according to the next
switch module input group number.
For example, a system with two SWMn-3A switches, with six groups. Each SWMn-3A makes a three groups shift
(one SWMn-1C only does one). Therefore when the LED tester is connected to the first switch module output,
while the system first group is ON, one should see the three LEDs of the 4
th
group on. If the LED tester is
connected to the second switch module output and the 4
th
group is ON, the three LEDs of the 1
st
group on.
Each SWMn-3A conducts a 3 groups shift, therefore for two switch modules, after six shifted channels the LED
tested begins back from the start (cyclic shift).
l see on the controller
screen the error number seven and the system turn off all the groups that were connected.
Appendix I: Communication
G
ENERAL
The system supports two communication protocols:
Elcom
Elspec's unique high-speed communication protocol, enabling the fastest serial communication using
PowerIQ software.
MODBUS Standard communication protocol, used for communicating with software other than the PowerIQ.
This protocol requires a controller with the EQC/ACR
2-
option.
Since the system contains a "self-configuration" function, no protocol type and baud rate settings are required.
The only setup is Salve ID for MODBUS protocol.
MODBUS
P
ROTOCOL
The system communicates using MODBUS/RTU with 8 data bits, No Parity and 1 stop bit. The baud rate is set
automatically between 9600 to 115200 bps and the Slave ID is set from the front panel
All the parameters are 4x registers and read using either function 3 (Read Holding Registers offset 40000) or
function 4 (of the same functionality offset 30000). The format of all data is float in real values (e.g. Volts,
Amperes) using the standard MODBUS byte order. In some applications it is necessary to set the byte order.
Certain applications do not support float format. Converting from four bytes to float, according to IEEE 754
floating point, can be done as in the following procedure (0x indicates hexadecimal numbers):
If the value is 0x7F800000, it is positive infinity.
If the value is 0xFF800000, it is negative infinity.
If the value is in the range 0x7F800001 through 0x7FFFFFFF or in the range 0xFF800001 through 0xFFFFFFFF,
it is NaN