SN Command — Serial Number

Query the device’s electronic serial number (SN), assigned during manufacturing for hardware traceability.

What is it for?

The SN command allows you to obtain the manufacturing identifier for:

• 📋 Warranty management — Equipment registration and validation
• 🔍 Traceability — Tracking from manufacturing
• ✅ Validation — Verify original Rinho products
• 🔧 Technical support — Identification in RMA tickets
• 📊 Inventory — Hardware control

Syntax

Practical Examples

Basic query

>QSN<
>RSNEFCDAB286F240000000000EA;ID=974862;*6D<  // SN: EFCDAB286F240000000000EA

SN breakdown

For RSNEFCDAB286F240000000000EA: the first 6 bytes (EF CD AB 28 6F 24) are the MAC 24:6F:28:AB:CD:EF read in reverse, the next 5 bytes are zero padding, and the last byte (EA) is the checksum.

The SN is not ASCII text

Unlike what a breakdown “by model” suggests, the SN is always derived from the chip’s MAC (reversed) plus padding and checksum, regardless of the device model. There is no variant where the SN encodes the model name in ASCII.

SN vs IMEI — Differences

Verify the Checksum

The last byte of the SN is an XOR of the previous 11 bytes. It’s used to detect transcription errors when copying the SN by hand, not to decode text.

# Python
sn_hex = "EFCDAB286F240000000000EA"
b = bytes.fromhex(sn_hex)
checksum = 0
for x in b[:11]:
    checksum ^= x
assert checksum == b[11], "Corrupt or mistyped SN"

# PowerShell
$sn = "EFCDAB286F240000000000EA"
$bytes = [byte[]]::new($sn.Length / 2)
for ($i = 0; $i -lt $sn.Length; $i += 2) {
    $bytes[$i/2] = [Convert]::ToByte($sn.Substring($i, 2), 16)
}
$checksum = 0
for ($i = 0; $i -lt 11; $i++) { $checksum = $checksum -bxor $bytes[$i] }
$checksum -eq $bytes[11]  # True if the SN is valid

Use Cases

Technical support registration

// 1. Query SN
>QSN<
>RSNEFCDAB286F240000000000EA;ID=974862;*6D<
 
// 2. Query IMEI
>QIMEI<
>RIMEI865851037974862;ID=974862;*4D<
 
// Data for ticket:
// - SN: EFCDAB286F240000000000EA
// - IMEI: 865851037974862

Verify modem replacement

// Before replacement
>QSN<
>RSNEFCDAB286F240000000000EA;ID=974862;*6D<  // Same SN ✓
>QIMEI<
>RIMEI865851037974862;ID=974862;*4D<         // Old IMEI
 
// After replacement
>QSN<
>RSNEFCDAB286F240000000000EA;ID=974862;*6D<  // Same SN ✓
>QIMEI<
>RIMEI865851038012345;ID=974862;*5A<         // New IMEI ✓

Compatibility

See Also

• IMEI Query - Modem IMEI
• Configure ID - Equipment identifier
• VR Command - Firmware version