Checking Wi-Fi on a Mercury 115F cash register: From diagnostics to troubleshooting

Fiscal registrars Mercury 115F They are widely used in retail, but their operation directly depends on a stable internet connection. If the cash register has stopped sending receipts to the fiscal data operator, isn't syncing with the server, or is displaying "No connection" errors, the first thing to check is Wi-Fi module functionalityUnlike a wired connection, a wireless network is more vulnerable to interference, incorrect router settings, or faulty firmware.

In this article we will look at how to independently diagnose Wi-Fi on Mercury 115Fwithout resorting to a service center. We'll cover:

• 🔍 External signs of malfunction (which errors indicate problems with Wi-Fi).
• 📡 Checking the physical connection and router settings.
• 🛠️ Testing via the cash register menu (including hidden service commands).
• 🔧 Typical mistakes and ways to fix them (from resetting settings to updating firmware).

Important: If your cash register is under warranty, certain actions (such as disassembling the case to check the antenna) may result in loss of the antenna. In such cases, it is best to contact an authorized service center. Incotex.

1. Signs of non-working Wi-Fi on the Mercury 115F

Before checking your settings, make sure the problem is truly related to your wireless network. The following symptoms may indicate a faulty Wi-Fi module or incorrect connection:

• 🚨 Error: "No connection with OFD" when trying to print a receipt (even if the Internet is working on other devices).
• ⚠️ Error code 2108 ("Connection Error") or 2110 ("Connection timeout") on the checkout screen.
• 🔄 Constant reconnections: the cash register sometimes finds the network, sometimes loses it.
• 📵 No Wi-Fi icon in the display status bar (should show as antenna or waves).
• ⏳ Hanging when sending data to the tax office (the “Sending…” indicator hangs for more than 5 minutes).

If at least one of these symptoms appears, proceed to diagnosis. But first, rule out problems on the OFD side: Sometimes errors are related to technical work at the fiscal data operator. Check the service status on your fiscal data operator's website (e.g., Taxcom, Payment Center or Evotor).

⚠️ Attention: if the cash register gives an error 2104 ("Invalid data format")The problem is most likely with the fiscal storage device settings, not the Wi-Fi connection. In this case, re-registering the fiscal storage device is required.

2. Checking the physical connection and router

Start with the basics—often the problem isn't with the cash register, but with the network equipment. Here's what to do:

1. Make sure the router is turned on. and distributes Wi-Fi. Check the indicators on the case: the wireless network icon (usually indicated by waves or an antenna) should be lit.
2. Reboot your router: Unplug the power cord for 30 seconds, then plug it back in. Wait for it to fully load (1–2 minutes).
3. Check your Wi-Fi range:
   • 📶 Mercury 115F works only in the range 2.4 GHzIf your router is configured to 5 GHz, the cash register will not see the network.
   • 🔒 Make sure the network not hidden (The “Hide SSID” checkbox must be unchecked in the router settings).

Measure the signal levelIf the cash register is located far from the router (more than 10 meters) or there are concrete or metal walls between them, the signal may be too weak. Try moving the cash register closer or using Wi-Fi repeater.

Also check if the network is blocking MAC filtering in the router settings. To do this:

1. Go to the router's web interface (usually at 192.168.0.1 or 192.168.1.1).
2. Find the section Wireless Network → MAC Filter.
3. Make sure that the MAC address of the cash register (indicated on the sticker on the back of the case) allowed or filtering is disabled.

The router is turned on and distributing Wi-Fi|The network operates in the 2.4 GHz range|SSID is not hidden|MAC filtering is disabled or the cash register MAC address has been added|The cash register is within the network coverage area-->

3. Wi-Fi diagnostics via the cash register menu

If everything is OK with the router, proceed to the cash register settings. To check the Wi-Fi on Mercury 115F follow these steps:

1. Turn on the cash register and wait for the main screen to load.
2. Click the button Menu (or F, depending on the firmware).
3. Go to the section Settings → Network settings → Wi-Fi.
4. Select an item Search for networksThe cash register should display a list of available Wi-Fi networks.

If networks are not displayed:

• 🔌 The Wi-Fi module is disabled in the cash register settings. Try turning it on manually (switch Wi-Fi: On/Off).
• 🛠️ The Wi-Fi module is faultyIn this case, repair or replacement will be required.
• 📵 The antenna is not connected (This applies if the cash register was disassembled). Check that the antenna connector is firmly seated on the board.

If networks are displayed, but the cash register does not connect:

1. Select your network from the list.
2. Enter your password (case sensitive!).
3. Click Connect.

If the connection does not occur, check:

• 🔐 Correctness of the password (try entering it on another device).
• 🔄 Encryption type. Mercury 115F supports WPA2-PSK (recommended) and WPA-PSK, but may not work with WPA3 or outdated WEP.

4. Checking the connection using test commands

If the cash register connects to Wi-Fi but the internet isn't working, check the connection using the built-in tests. To do this:

1. Go to Settings → Service → Connection Test.
2. Select Ping and enter the address 8.8.8.8 (DNS Google) or ya.ru.
3. Click Start.

Test results:

If the ping works but the checks are not sent, check proxy settings (must be disabled) and router firewall (it can block OFD ports). For Taxcom And Payment Center ports must be open TCP 7777 And TCP 7778.

Which ports should be open for OFD?

To work correctly with most OFDs (Taxcom, Payment Center, Evotor), the following ports must be opened:

- TCP 7777 — to send checks.

- TCP 7778 — to synchronize data.

- TCP 443 — for HTTPS connections (if used).

If the ports are closed, contact your ISP or set up port forwarding on your router.

5. Typical errors and their elimination

Let's look at the most common Wi-Fi problems Mercury 115F and ways to solve them.

Error 2108 ("Connection Error")

Reasons:

• 🔌 There is no physical connection to the network (Wi-Fi is disabled or the router is not working).
• 🔒 Incorrect password or encryption type.
• 📡 Weak signal (level less than 30%).

Solution:

1. Check your Wi-Fi connection (see section 3).
2. Make sure that your router distributes IP addresses via DHCP (or enter a static IP manually).
3. If the signal is weak, use a repeater or move the cash register closer to the router.

Error 2110 (Connection timeout)

Reasons:

• 🔄 Network congestion (many devices are connected to the router).
• 🛡️ Blocked by firewall on the router or at the provider.
• 🔧 Incorrect DNS (for example, providers that do not work).

Solution:

1. Disconnect unnecessary devices from Wi-Fi.
2. In the checkout settings, enter Google DNS (8.8.8.8 And 8.8.4.4).
3. Check if your antivirus or router firewall is blocking the connection to the OFD.

The cash register doesn't detect the Wi-Fi network.

Reasons:

• 🛠️ The Wi-Fi module is faulty cash desks.
• 📵 The antenna is disconnected (relevant after renovation).
• 🔄 Firmware failure (less often).

Solution:

1. Restart the cash register (button Nutrition or unplugging from the socket for 10 seconds).
2. If this does not help, please contact a service center to diagnose the module.

⚠️ Attention: If Wi-Fi stops working after a firmware update, try rolling back the software to the previous version. To do this, download the old firmware from the website. Incotex and perform a rollback through Service → Software Update.

6. Firmware update and reset

If all the previous steps don't help, the problem may be with the cash register software. In this case, firmware update or reset settings.

Firmware update

To update:

1. Download the latest firmware version for Mercury 115F With official website (Support section).
2. Unzip the archive and copy the firmware file (usually with the extension .bin or .upd) to a flash drive (FAT32).
3. Insert the flash drive into the cash register.
4. Go to Settings → Service → Software Update.
5. Select the firmware file and confirm the update.

⚠️ Do not turn off the cash register during the update! The process takes 3-5 minutes. Once complete, the cash register will reboot automatically.

Factory reset

If the firmware did not help, perform a hard reset:

1. Go to Settings → Service → Reset settings.
2. Select Full reset (all data will be deleted, including network settings!).
3. Confirm the action.

After reset:

• 🔧 Set up Wi-Fi again (see section 3).
• 📝 Re-register the fiscal storage device (if necessary).

7. Alternative connection methods

If Wi-Fi still doesn't work, consider alternative options for connecting your cash register to the internet:

• 🔌 Wired connection (Ethernet):

  Connect the cash register to the router via cable LANTo do this:

  1. Buy an adapter USB-to-Ethernet (if there is no RJ-45 connector at the cash register).
  2. In the checkout settings, select Connection type: Wired.
  3. Specify the IP address, mask and gateway (usually assigned automatically by DHCP).

📶 3G/4G modem:

If there is no wired internet, use a USB modem (for example, MegaFon M150-2 or Yota). Connect it to the cash register and set up the connection in the menu Network Settings → Modem.

🔄 Hotspot mode on a smartphone:

Temporary solution: enable Wi-Fi hotspot on your phone and connect the cash register to that network. This is useful for testing.

A wired connection is the most stable option, but requires cable installation. A 3G/4G modem is convenient for mobile retailers and markets, but depends on carrier coverage.

FAQ: Frequently asked questions about Wi-Fi on the Mercury 115F

The cash register connects to Wi-Fi, but receipts aren't being sent. What's the problem?

The problem is most likely not with Wi-Fi, but with the fiscal data operator (FDO) or fiscal storage device settings. Check:

• 🔗 Correctness of the OFD server address (must be in the format ofd.ru or IP).
• 🔑 Correctness of the token or login/password for the OFD.
• 📅 Fiscal storage device validity period (if it has expired, it needs to be replaced).

Also make sure that the ports 7777 And 7778 open on the router.

How can I find the MAC address of a cash register to add it to a router?

The MAC address is located on the sticker on the back of the case. Mercury 115F (format: 00:1A:2B:3C:4D:5E). It can also be found in the cash register menu:

1. Go to Settings → Device Information.
2. Find the line MAC address (Wi-Fi).

Is it possible to connect Mercury 115F to a hidden Wi-Fi network?

Yes, but you will have to enter the network name (SSID) and password manually:

1. Go to Settings → Network settings → Wi-Fi.
2. Select Add a network manually.
3. Enter SSID (network name), encryption type (WPA2-PSK) and password.
4. Save the settings and restart the cash register.

My cash register displays "Authentication Error" when connecting to Wi-Fi. What should I do?

This error means that the cash register cannot connect to the network due to:

• 🔑 Incorrect password (check case and symbols).
• 🔒 Unsupported encryption type (For example, WPA3 or WEP).
• 🛡️ MAC address blocking on the router.

Solution:

1. Make sure the password is entered correctly.
2. Change the encryption type on your router to WPA2-PSK.
3. Disable MAC filtering or add the cash register's MAC address to the list of allowed ones.

After updating my firmware, my Wi-Fi stopped working. How can I revert to the previous version?

If the new firmware caused a Wi-Fi failure, you can roll back to the previous version:

1. Download the old firmware from Incotex website (section "Firmware archive").
2. Copy the file to a flash drive (FAT32).
3. Go to Service → Software Update.
4. Select the old firmware file and confirm the rollback.

⚠️ Attention: A firmware rollback may reset your cash register settings. Save important data (such as fiscal reports) beforehand.