Function
Function
isoBAT425_D00308_04_M_XXEN/07.2020
14
Delay on release
t
off
The delay on release
t
off
can be set uniformly for all messages in the
using the
parameter "toff", whereby each alarm message specified in the alarm assignment has its
own timer for
t
off
. An alarm will continuously be signalled until the threshold value of the
respective measured value is not violated (including hysteresis) for the period of
t
off
wit-
hout interruption. Each time the threshold value is not violated for the period of
t
off
, the
delay on release "toff" restarts once again.
Start-up delay
t
After connection to the supply voltage
U
S
the alarm indication for the preset time
(0…10 s) in the parameter "t" is suppressed.
3.2.13 Password protection (on, OFF)
If password protection has been activated (on), settings can only be made subject to the
correct password being entered (0...999).
3.2.14 Factory settings FAC
Activating the factory setting will reset all modified settings, with the exception of the in-
terface parameters, to the default upon delivery.
3.2.15 Fault memory
The fault memory can be activated or deactivated using the parameter "M" in the
. When the fault memory is activated, all pending alarm messages of the LEDs and
alarm relays remain available until they are deleted by using the reset button (internal/
external) or the supply voltage
U
s
is turned off.
3.2.16 History memory HiS
The measured value indications possible at the time of an alarm according to the config
table are stored in the empty history memory. Saving again is only possible after clearing
the history memory via the menu. During the start-alarm phase and due to the message
"
TEST
"
, no information is written to the history memory.
3.2.17 Interface/protocols
The ISOMETER® uses the serial hardware interface RS-485 with the following protocols:
•
BMS
The BMS protocol is an essential component of the Bender measuring device interface
(BMS bus protocol). ASCII characters are used for the data transfer.
•
Modbus RTU
Modbus RTU is an application layer messaging protocol and it provides Master/Slave
communication between devices that are connected altogether via bus systems and net-
works. Modbus RTU messages have a 16-bit-CRC (Cyclic-Redundant Checksum), which
guarantees the reliability.
•
IsoData
The ISOMETER® continuously sends an ASCII data string with a cycle of approximately
1 s. A communication with the ISOMETER® within this mode is not possible and no addi-
tional transmitter may be connected via the RS-485 bus cable. The ASCII data string for
the ISOMETER® is described on
.
The parameter address, baud rate and parity for the interface protocols are configured in
the
.
With "Adr = 0", the menu entries baud rate and parity are not shown in
the menu and the IsoData protocol is activated. With a valid bus address
(i.e. not equal to 0), the menu item "baud rate" is displayed in the menu.
The parameter value "---" for the baud rate indicates the activated BMS
protocol. In this event, the baud rate for the BMS protocol is set to 9,600
baud. If the baud rate is set unequal to "---", the Modbus protocol with
configurable baud rate is activated.
