GERMAN METERING OP-735 Bluetooth Optical Probe User Manual
- June 4, 2024
- GERMAN METERING
Table of Contents
GERMAN METERING OP-735 Bluetooth Optical Probe
How to use the device
Bluetooth Optical Probe
The OP-735 is a device for communication between measurement devices that comply with IEC62056-21 (mode C, E), IEC62056-31, DLMS standards for optical port, such as electricity meters, gas correctors… with computers, handheld devices, tablets and other Bluetooth-enabled devices. It is also possible to communicate in transparent mode. The Bluetooth of OP-735 supports both Classic and BLE (Bluetooth Low Energy) modes. All process steps of the optical port, such as pairing, the connection to the meter, and the battery charge of the device are visible from the device’s LEDs. The battery is Lithium Polymer with a capacity of 360mAh. It provides 14 hours working time for each charge. Charging the device through both the adapter and the PC via a USB Type C cable is possible. There are some configurations in OP-735 such as Bluetooth name, Optical port frame and baud rate, mode, etc., that can be changed through Bluetooth commands. All these commands and their descriptions are in table 1.
Electrical Specifications
- IEC 62056-21 standard for optical port
- Bluetooth version 4.1 standard, Classic and BLE modes
- Communication with measurement devices according to IEC62056-21 (Mode C, E), IEC62056-31, DLMS standards and TRANSPARENT mode for other standards such as MODBUS
- 10m unobstructed Bluetooth connection range
- Communication speed (baud rate) from 300 to 19200 bps
- 3-colored LEDs for displaying battery charge
- Pairing status, Sending and receiving data LED indicator
- Lithium Polymer 3.7V, 360mAh battery
- On/off switch
- USB Type C port for charging
Mechanical Specification
- Weight: 50 gr
- Dimension: 32x43mm
- Magnet power: more than 15 Newtons
- Body Material: ABS
- Ambient light filter
USB Connector
The USB C connector is embedded to charge the battery. The LED1- LED3 will
flash three times after connecting the USB cable and depending on the amount
of charge, the corresponding LED will start blinking:
- Blinking LED1: charge rate 0-33%
- Blinking LED2: charge rate 34-66%
- Blinking LED3: charge rate 67-100%
- All LEDs on: complete charge
After charge is complete, all the LEDS will stop flashing and stay on.
Battery Indicator LEDs (Charge)
These LEDs represent the amount of battery charge as follows:
- Blinking LED1: Battery charge is less than 10%
- LED 1 ON: Battery charge is 10-33%
- LED 2 ON: Battery charge is 34-66%
- LED 3 ON: Battery charge is 67-100%
STATUS Indicator LED
This LED represents the Bluetooth status. There are three colors; Orange,
Green and Red. Each color and their behavior represent one of the following
modes.
- Orange: When device is turned on and also not connected to any other device.
- Green: When device is connected to another Bluetooth device.
- Flashing Green: Device is communicating and transferring data between the other Bluetooth device like tablet or notebook.
- Red: At this state device is turned on but is stuck in boot state. It indicates that device firmware is needed to be updated.
- Flashing Red: Indicates optical port communication and data transfer between device and the target device that must be read or configured.
POWER Button
The function of this button is to turn the OP-735 on and off. By pressing it,
the OP-735 will turn on and by pressing again; the OP-735 will turn off.
Software Specifications
Connecting to meter
The OP-735 is capable of connecting with all devices in IEC62056-21 standards
Working Modes
OP-735 can work on two Transparent and IEC modes. The functionality is as
follows:
IEC
In this mode the optical port is capable of changing baud rate between the
IEC62056-21 standard automatically. Also, it can communicate with meters that
support direct DLMS with 9600 speed(baudrate) and IEC62056-31 standard with
1200 speed automatically, no need any additional setting
Transparent
In this case the meter does not comply with any modes in IEC described before
(for example it supports Modbus standard or the first communication frame was
none of above), user shall put optical probe in transparent mode and configure
communication frame according to the optical port setting commands. In this
mode optical probe will transfer the data no matter the packet type, to the
other side.
Note: At this mode optical probe cannot do any changes in the
communication frame with the meter and will only transfer the received data
from one side to another.
Settings
To send the settings or upgrade firmware, you can use any program that is
capable of sending commands using Bluetooth. You can also use windows-based
application “Bluetooth Optical port tools”.
Using Windows Application
Open “Bluetooth Optical port tools” and choose the corresponding COM port to
the optical probe. On the “Settings” section, choose the desired “commands”
and click “Read” to collect data and “Write” to configure. If the selected
command has the configuration capability, the parameters can be chosen in the
“Params” section according to the configuration type. For example, the
parameters for optical port communication frame in transparent mode. The
collected value will be displayed in front of “Value” after collection
.
Using Commands
The following table shows the commands associated with each configuration that
must be sent to optical probe.
Set up and collection of the optical port communication frame is as follows:
- Baud rate, Number of Bit, Parity, Stop bit
The values for each parameter are as follows:
- Baud rate: 300, 1200, 2400, 4800, 9600, 19200
- Number of Bit: 7, 8
- Parity: N (none), E (even), O (odd)
According to the above description, if we want to connect with the meter with baud rate: 4800 and number of bits: eight and parity: E with the last 1 bit, the command format will be as follows: AT+AD Frame =4800,8,N,1
Note: In case any command other than the mentioned commands are sent to the optical probe, “Invalid Command!” will be returned and if parameters are not set correct, “Invalid Parameters!” will be returned.
Upgrading Firmware
The firmware can be upgraded in two ways:
- Send the file through the windows-based application
- Send the file through any program via Bluetooth that can send commands
Upgrade using windows-based application
In order to upgrade OP735 using “Bluetooth Optical port tools”, first choose
the associated file in “File” section by clicking on the “Select Boot File”
and then press the “load boot file” button.
Upgrading via other applications
To send the file through other programs, each line of the file must be sent
separately to the device, and for each line, an ACK (06H) must be received
from the device, then the next line must be sent. If a NACK byte (15H) is
received instead of ACK, that line must be resent. In fact, receiving NACK
indicates an error in the sent line format. Sample sent file:
How to pair with Android device
First, turn on the Bluetooth of android device, then turn on the OP-735, enter
the Bluetooth settings of the android device, and pair the OP-735 with it.
After pairing, there is no need to re-pair (even after turning device on and
off). These pictures show all steps of pairing OP-735 with android:
How to pair with IOS device
Turn on the OP-735 and follow steps below:
- Step 1: On your IOS device, go to Settings > Bluetooth and turn on Bluetooth. Stay on this screen until you see the OP-735.
- Step 2: Tap on OP-735.
- Step 3: You might need to enter the PIN. The OP-735 pin code is “0” (zero). After pairing, there is no need to re-pair (even after turning device on and off).
How to connect in Windows 10
The OP-735 is Bluetooth-enabled, and other device should be Bluetooth-enabled too. To connect OP-735 to your Computer/Laptop follow steps below:
- Step 1: Make sure your device bluetooth is on and click on “Add Bluetooth or other device” in the Bluetooth settings in Settings Menu:
- Step 2: In New form click on “Bluetooth”:
- Step 3: Click on found OP-735 with audio type and click “Connect”:
- Step 4: Click “done” after connection is complete.
- Step 5: After connecting, a COM port for the OP-735 is created on the computer, to know its port number, scroll down to the end of the form and click on “More Bluetooth options”:
Click on “COM Ports” tab and find your OP-735 serial number with outgoing direction.
How to connect in Linux
To connect OP-735 with your Linux device flow steps below:
-
Step 1: Install BlueZ packages by using any of the following commands that matches your Linux distribution:
This installation provides the bluetoothctl utility. -
Step 2: You need to add your account to the lp group if you wish to connect to a bluetooth tether
-
Step 3: Start and enable the Bluetooth:
Use this command to check it out:
-
Step 4: Ensure Bluetooth is not disabled:
If it is blocked, unblock it by using the command below:
Confirm it is unblocked:
-
Step 5: Use bluetoothctl to connect to OP-735. Start the bluetoothctl interactive command:
Use this command to check it out:
-
Step 6: Turn on your bluetooth adapter:
-
Step 7: Turn OP-735 on and do a scan to detect it:
To stop scanning use this command:
-
Step 8: To pair with OP-735 use command “pair ”. You may need to confirm it.
Use this command to check it out:
-
Step 9: Connect to OP-735 after pairing:
Use this command to check it out:
Preparing for reading meter
Turn on OP-735 and put it on the optical port of the meter. After OP is turned on and before connecting with another Bluetooth device, LED will turn orange. First pair your tablet or laptop with the optical probe. After pairing with tablet or laptop, the LED on OP will turn green. If you are using pc for connecting with OP, first choose the Com port corresponding to the optical port in the software used correctly and then start transferring data. If you are using the meter reading application from German Metering, after pairing with tablet or phone, in Digital collection window, choose the serial number of the optical probe and then collect data from meter.
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