A stable internet connection is critical to the operation of any modern online cash registersWithout network access, the device will be unable to transmit sales data to the fiscal data operator, which entails a violation of the law and the risk of fines. Retail owners often face situations where wired Ethernet is unavailable or it is physically impossible to run a cable to the terminal's location.
In such cases, wireless technology comes to the rescue, allowing for quick and efficient data exchange. Cash registers of the series Mercury, in particular the popular 115F and 185F models, are equipped with built-in wireless modules. However, the initial setup process or reconnecting to a new router can be challenging even for experienced users, as the device's interface has its own unique features.
In this article, we will analyze a step-by-step algorithm of actions that will help you set up Wi-Fi connection On your fiscal registrar. We'll cover using the client app on your smartphone, configuring the router itself, and diagnosing potential connection errors. Proper network configuration will ensure the smooth operation of your business and automatic receipt sending.
Equipment preparation and compatibility testing
Before setting up, you need to ensure your equipment is ready for wireless operation. Not all cash register models have a built-in Wi-Fi module, so the first step should always be checking the technical specifications of your device. If the module is physically missing, software settings won't help, and you'll need to purchase an external antenna or replace the model.
It's also important to prepare the router itself for proper operation of the cash register. Mercury It's preferable to use the 2.4 GHz band, as many older modules don't support the 5 GHz frequency. Make sure you know the network name (SSID) and password, and that your router assigns IP addresses via DHCP, which is standard for most home and office networks.
⚠️ Attention: Make sure your cash register has the latest firmware version. Older software may contain errors in the Wi-Fi module drivers, which can result in an unstable connection or an inability to enter passwords with special characters.
To set up your cash register, you'll need a smartphone running Android or iOS with the Mercury app installed (or Mercury LK, depending on the model). The initial configuration of the cash register's network parameters is performed via the mobile device before full trading begins. Without this step, the device won't be able to find your network in the list of available networks.
Router Setup: Important Security Settings
Proper operation of a cash register directly depends on the security settings configured on the access point. Cash registers often don't support complex corporate authentication protocols, such as Enterprise, so they require a separate guest network or the default settings of a home router.
Particular attention should be paid to the encryption type. Cash registers Mercury work best with standard WPA2-PSK (AES). Using legacy WEP or mixed WPA/WPA2 modes can cause connection conflicts. If your router automatically selects "mixed" mode, try forcing it to use WPA2 only.
- 📡 Frequency range: Make sure your network is running at 2.4GHz as this ensures compatibility with most modules.
- 🔒 Encryption type: Use WPA2-PSK (AES) for maximum compatibility and data security.
- 📶 Broadcast channel: It is recommended to set a static channel (1, 6 or 11) to avoid interference from neighboring networks.
- 🚫 MAC Filtering: If MAC address filtering is enabled on your router, be sure to add the cash register address to the whitelist.
Another important parameter is band steering. Some modern routers combine 2.4 and 5 GHz networks under a single name. The cash register may attempt to connect to an incompatible frequency and be rejected. It's best to explicitly separate the network names in the router settings, adding, for example, "_2.4G," so the cash register can accurately select the correct band.
Step-by-step instructions for connecting via the app
The main method for setting up a network at the cash register Mercury This is done via a mobile app. This method is the most convenient, as it allows you to use your smartphone's keyboard to enter your password, eliminating typing errors on the cash register buttons.
To begin, turn on the cash register and wait for the operating system to load. Open the app on your smartphone and connect it to the Wi-Fi network you plan to connect the cash register to. In the app menu, select your device from the list of available ones (connection can be via Bluetooth or USB, depending on the model).
☑️ Connection checklist
After entering the control menu, go to the section Settings -> Net (or Internet). Find "Wi-Fi" and toggle the switch. The device will begin searching for available networks. Select your router's name from the list that appears. If the network is hidden, select "Add network" and enter the SSID manually.
When entering the password, be extremely careful with the case. The system won't immediately display an error, but the connection won't be established. After entering the information, click "Save" or "Connect." The cash register will attempt to obtain an IP address from the router. The connection status is usually displayed at the top of the screen or in the same settings menu.
Manual configuration of IP and DNS addresses
In most cases, it is enough for the cash register to automatically receive the settings according to the protocol DHCPHowever, in corporate networks or if the provider has specific requirements, manual IP address assignment may be required. This often resolves connection issues or inability to process bills.
To switch to manual mode, uncheck "Use DHCP" (or "Obtain IP automatically") in the Wi-Fi settings menu. This will enable the numerical entry fields. You'll need to know your local network's addressing scheme to avoid address conflicts.
| Parameter | Description | Example of meaning |
|---|---|---|
| IP address | Unique address of the cash register on the network | 192.168.1.155 |
| Subnet mask | Determines the size of the network | 255.255.255.0 |
| Gateway | Router address for Internet access | 192.168.1.1 |
| DNS 1 | Primary name server | 8.8.8.8 |
It's recommended to use public addresses from Google (8.8.8.8 and 8.8.4.4) or Yandex (77.88.8.8) as DNS servers, as they provide high response speed and stability. If you're unsure of the gateway address, check the connection settings on any other device on the same network.
What to do if IP addresses conflict?
If you assign your cash register an IP address that's already occupied by another device (such as a printer or laptop), a conflict will occur. As a result, neither device will be able to operate properly on the network. To avoid this, choose addresses at the end of the range, for example, above 200 (192.168.1.200+), as DHCP servers typically assign addresses starting with 2 or 100.
Diagnosing problems and troubleshooting
Even with proper setup, situations may arise where the cash register doesn't detect the network or doesn't transmit receipts. The first sign of a problem is a blinking Wi-Fi indicator or a connection error message in the event log. Often, the problem stems from a weak signal or a changed router password.
If the cash register displays "No connection to the fiscal data operator" but Wi-Fi is connected, check the date and time on the device. A time desynchronization of more than 5 minutes blocks fiscal data transmission. It's also worth checking whether your router is blocking outgoing connections on the ports used by the fiscal data operator (usually 443 or 8443).
- 🔄 Reboot: Turning the router and cash register off and on again solves 80% of problems with module freezing.
- 📉 Signal level: Bring the cash register closer to the router to test; if the problem goes away, you need a repeater.
- 🔑 Password: Make sure your password does not contain Cyrillic or special characters that the cash register may interpret incorrectly.
In some cases, resetting the network settings to factory defaults can help. To do this, find the "Reset network settings" option in the cash register menu, or perform a complete firmware update from scratch if the issue is software-related. Be sure to back up your reports beforehand, if possible.
⚠️ Attention: Menu interfaces and item names may differ slightly depending on the firmware version of your model. MercuryAlways check the official user manual for your specific model, as manufacturers regularly update software.
Frequently Asked Questions (FAQ)
Is it possible to connect the Mercury cash register to a hidden Wi-Fi network?
Yes, this is possible, but it requires manual configuration. In the network selection menu, select "Add network" (or similar) and manually enter the exact name (SSID) and password. The automatic search does not reveal hidden networks.
My cash register stopped sending receipts after changing the router password. What should I do?
You need to re-enter the Wi-Fi settings at the checkout, find your network (it may show up with a connection error) and select "Forget network" or simply enter a new password over the old one in the configuration menu.
Does Mercury 115F support 5 GHz networks?
Most cash register models, including the Mercury 115F, operate only in the 2.4 GHz band. If your router only broadcasts on the 5 GHz band, the cash register simply won't detect it. You need to enable dual broadcasting or a separate 2.4 GHz network.
How can I find the cash register's IP address for an Ethernet connection if Wi-Fi isn't working?
If the cash register is connected via a cable, the IP address can be found in the connection status report (Z-report or connection test) or through the Mercury app by connecting to the cash register via USB/Bluetooth and going to the network settings.