LSM-81 – GSM/LTE annunciator module

LSM-81 – GSM/LTE annunciator module

Web Managed
GSM / LTE 900-2600 Mhz
Extended operating temperature range -20°C to +70°C
25 phone numbers plus one supervisor number, including names
24 binary and 8 analog message blocks each with its own message text and selectable
alarm target range from the telephone number memory
8 binary inputs and outputs plus 2 analog inputs.
Expandable with optional I/O modules
Aluminum DIN-rail housing 80 x 108 x 62 mm

The LSM-81 is a compact annunciator module for the public GSM and LTE networks and the successor of the GSM-2110/4110 series.
The basic unit has 8 digital inputs, 8 digital outputs and 2 analog inputs (0/4-20mA, optionally 0- 10V).

All inputs and outputs are galvanically isolated. By means of expansion modules of the PEM series the inputs and outputs can be extended up to 24 digital inputs/outputs as well as 10 analog inputs. For the alarms, 24 binary and 8 analog signal blocks are available. For each binary signal block, different conditions of the digital inputs can be configured (AND, OR, INVERS, XOR), which lead to the triggering of the alarm. For the analog signal blocks, these can be overrange or underrange of analog values.

Each message block has a freely configurable alarm text, which can be sent by SMS to up to 25 participants. Parallel or sequential alarming with optional acknowledgement via SMS or call to the device are possible.
For each alarm block, additional features such as an adjustable acknowledgement waiting time, switch-on delay, real alarm time, the addition of the timestamp of the alarm triggering and the device name are available.
message triggering as well as the device name or a configurable output action are available.

Extensive LED displays on the front panel of the LSM-81 provide information at any time about the most important device states such as active inputs / outputs, field strength of GSM/LTE reception, active message blocks and alarms as well as the operating status of the device.


The configuration is done via the integrated web server without the need for additional software. The free “IPLoader” software can be used to save and
configuration as well as a cloning into further LSM-81 is possible.
The first 8 message blocks are already preconfigured at the factory, so that the first messages can be sent after inserting a SIM card and entering a destination number and SIM PIN.
the first messages can be sent.


With the optional PicoLogo application platform (available Q2/2022), local control functions similar to a small PLC/RTU or additional alarms with more complex logic conditions can be freely implemented.
alarms with more complex logic conditions can be freely programmed via a graphical editor.
PicoLogo can be activated on all LSM-81s via a license activation.

Mobile radio

GSM : 900 / 1800 Mhz
LTE : 800 MHz, 900 MHz, 1800 MHz, 2100 MHz, 2600 Mhz
SIM card: MicroSIM push/pull card reader, accessible from the outside
Phone number memory: 25 phone numbers plus one supervisor number, including names

Power supply

Operating voltage: 12-24V DC (+/- 20%)
Power consumption: ~ 130mA at 12V (logged in LTE) ~ 70mA at 24V (logged in LTE)
The power supply must be able to deliver 1A for a short time.

Hardware parameters

Operating temperature/humidity: -20°C ~ +70°C; 5%~90% RH non-condensing
Storage temperature/humidity: -20°C ~ +85°C; 5%~95% RH non-condensing
Dimensions (H*W*D): 80 x 108 x 62 mm (without connectors and antennas)
Housing: aluminum DIN-rail housing with metallized plastic side panels


RJ45: 1x 10/100 Mbit/s interface
Serial: 1x RS232/485 DB9
Expansion port: Expansion port for additional I/O modules
Antenna connector: 1x SMA socket
Message blocks: 24 binary and 8 analog message blocks, each with its own message text and selectable alarm target area from the telephone number memory
Inputs and outputs:
8 binary inputs (12-24V DC)
8 binary outputs (12-24V DC)
2 analog inputs (0/4-20mA)
Expandable to 24 binary inputs/outputs and 10
analog inputs for internal alarming

Optional accessories

Different antenna types on request
LTE-ANT omnidirectional
LTE-ANT Magnetic base
LTE-ANT Planar

Power supply:
Power supply PNT-230/12B with emergency power supply

Expansion modules (up to 16 simultaneously):
PEM-16DI 16 digital inputs
PEM-32DI 32 digital inputs
PEM-16DO 16 digital outputs
PEM-32DO 32 digital outputs
PEM-16DIO 16 digital inputs and 16 digital outputs
PEM-08AI 8 analog inputs (0-20mA 4-20mA)
PEM-04AO 4 analog outputs (0-20mA 4-20mA)

The transmission of my personal data is voluntary. I have the opportunity to withdraw my data at any time. My data is stored exclusively for the purpose of processing my request. A passing on to third does not take place.

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