STWA4MH
12800-0711-00
Seite
6 / 8
www.ziehl.de
4
Summary of functions
•
Device search
•
Writing to and reading from all STW4MH registers
•
Cyclical reading in adjustable intervals
•
.csv-file export
•
Save / load user configuration
•
STWA4MH software update over RS485
5
Commissioning
5.1 How to add a new device to the bus
After applying the supply voltage U
S
address 247 is additionally active for 60s (LED flashes at 0,5s intervals).
The device can be found by using a device search with a limited address range from 247 to 247 (see paragraph
). A double click on the new item opens the device menu (see paragraph
). By using menu area (3) a
new unique slave address can be assigned to the device (see paragraph
).
5.2 How to start a device search
A device search can be started by clicking at
“search device” in the main menu (see paragraph
). This opens
a connection menu (see paragraph
) where the necessary parameters must be set. To reduce the duration
of the search it is possible to limit the slave addresses to a range where a device is expected. If a device is
found a new item is added to the table (6) in the main menu. Right click to display the context menu (7) which
offers options to delete a single or all table entries or update the STW4MH software.
5.3 How to start an extended device search
To find a device with unknown connection settings an extended device search can be used. An extended device
search can be started by clicking at
“extended search device” in the main menu (see paragraph
). This opens
a connection menu (see paragraph
). An extended search checks every possible combination of baud
rate, slave address, parity and stop bit for a device. If a device is found, a new item is added to the table (6) in
the main menu. To reduce the duration of the search it is possible to exclude specific combinations by
deactivating the appropriate check boxes.
5.4 How to write to the STWA4MH register
The following registers can be changed through menu area (3),
Register
Value / value range
Slave address
1 … 246
Baud rate
4800Bd, 9600Bd, 19200Bd, 57600Bd, 115200Bd
Parity
no parity, even parity, odd parity
Stop bit
1 Stop bit, 2 Stop bits
Conversion factor
1 … 10
By clicking at
“apply changes” the selected values are transmitted to the registers. Changes get discarded if
any value is not valid or the transmission failed.
5.5 How to read from the STWA4MH register
The following registers can be read through menu area (4),
Address Register
Value / value range
0
Modbus address
1 … 246
1
Baud rate
4800Bd, 9600Bd, 19200Bd, 57600Bd, 115200Bd
2
Parity
no Parity, even Parity, odd Parity
3
Stop bit
1 Stop bit, 2 Stop bits
4
Conversion factor
1 … 10
5 - 15
-
-
16
Status
0 = RMS measurement,
1 = average measurement (approx. < 0,5A),
2 = out of range (> 65A)
17
Reading I (Reading I / conversion factor)
0 … 60000 [mA]
18
Reading I, moving average 200ms
0 … 60000 [mA]
19
Reading I, moving average 1s
0 … 60000 [mA]
