11.5 F²C Communication Protocol and Commands
The LB 134 has several communication options with the PC, via the USB port and via the
RS485 interface. The baud rate for the USB interface is always 38400, for RS485 it can
be set under Parameters/Hardware. The other parameters are fixed: (data bits: 8; parity:
none; start bit: 1, stop bit 1, no handshake). Many functions of the device can be remote
controlled by an external PC or stored data can be transferred to this PC. Also, both the
parameters and the FIFO data can be transferred to a USB stick. The parameters can al-
so be restored from the stick to the device.
At the end of each cycle, the following data is written to a memory (FIFO):
Date/Time:
(Memory number: is sent with F2C)
Cycle number: 1..2000 (ushort)
Status: 12 character, ASCII Hex
Sample measurement time [sec]: 1.. 9999 (ushort)
Nuclide name / Measurement type name 1: Text[7]
Measured value 1: float
Unit 1: Text[6]
Integral value 1: float
Integral unit 1: Text[6]
Nuclide name 2: Text[7]
Measured value 2: float
Unit 2: Text[6]
Integral value 2: float
Integral unit 2: Text[6]
Integral time since last reset [h]: float
The depth of the FIFO is 2400 measured data.
With Read FIFO, the above data are transmitted in this order after the frame, see exam-
ples at the end.
11.5.1 Status Definition in LB 134
The current status of the measuring device is determined every second. This includes the
states of all errors and alarms. This information is summarized in 12 Ascii hex characters,
with each bit corresponding to a particular state.
These 5 characters are transmitted with the Get status command and with Autosave they
are stored to the memory after each current measuring time.
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