Function
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3.2.12 History memory HiS
When the first error occurs after clearing the history memory, all measured
values (that are marked in the table as Page 40) are stored in the history mem-
ory. This data can be read out using the "HiS" menu item. In order to be able
to record a new data record, the history memory must first be cleared via the
menu using "Clr".
3.2.13 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 alto-
gether via bus systems and networks. Modbus RTU messages have a 16-
bit-CRC (Cyclic-Redundant Checksum), which guarantees the reliability.
IsoData
The ISOMETER® continously sends an ASCII data string with a cycle time
of approximately 1 second. A communication with the ISOMETER® with-
in this mode is not possible and no additional transmitter may be con-
nected via the RS-485 bus cable. The ASCII data string for the
ISOMETER® is described in Chapter 9.
The parameter address, baud rate and parity for the interface protocols are
configured in the menu "out" .
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