HO Command
The HO (Hourmeter) command allows you to manage the device’s built-in hourmeter, ideal for tracking usage time in heavy machinery and vehicles.
What is it used for?
- ⏱️ Engine or machinery operating hours control
- 🔧 Preventive maintenance scheduling (service)
- 📊 Usage reports for productivity analysis
- 🚜 Ideal for heavy machinery, generators, agricultural fleets
The hourmeter is not automatically linked to any internal event. To start, stop, or reset the count, you must send specific commands or configure logic rules.
Syntax
Query hourmeter
QHOResponse: RHOabbbbbbbb
Configure hourmeter
SHOaParameters
| Parameter | Description |
|---|---|
a | Action to perform (see following table) |
bbbbbbbb | Accumulated time in seconds (hexadecimal, 8 digits) |
Available actions
| Value | Action | Description |
|---|---|---|
E | Enable | Starts/continues counting |
D | Disable | Stops counting |
C | Clear | Resets counter to zero |
S,value | Set | Sets value in hours (v1.9.17+) |
The counter starts at 00000000 (zero) when the system initializes.
Usage Examples
Query accumulated time
>QHO<
// Response: RHOE0001517F (E=active, 86399 seconds = 23h 59m 59s)Hexadecimal to hours conversion
| Hex | Decimal (sec) | Time |
|---|---|---|
00000E10 | 3600 | 1 hour |
0000708F | 28815 | 8 hours |
0001517F | 86399 | ~24 hours |
000D2F00 | 864000 | 10 days |
Manual control
>SHOE< // Start counting
>SHOD< // Stop counting
>SHOC< // Reset to zeroSet Custom Value
Available since v1.9.17 — Allows setting the hourmeter to a specific value in hours.
Syntax
>SHOS,value< // Sets hourmeter in hoursThe value is specified in hours with decimals.
Set examples
// Sync with equipment hourmeter (150.5 hours)
>SHOS,150.5<
>RHO OK...
// Set to 1000 hours of use
>SHOS,1000<
>RHO OK...
// Set with precise decimals
>SHOS,2345.75<
>RHO OK...Useful for syncing the GPS hourmeter with the actual usage hours of the machinery at installation time.
Automation with Rules
To link the hourmeter with vehicle ignition:
// Start when turned on (PWR+ with IGN active, or IGN+)
>SRL90E;TRG=PWR+;CND=IGN;ACC={SHOE}<
>SRL91E;TRG=IN07+;ACC={SHOE}<
// Stop when ignition is turned off
>SRL92E;TRG=IN07-;ACC={SHOD}<Result: The hourmeter automatically counts only when the vehicle is running.
Reports with Hourmeter
To include the hourmeter value in position reports, use:
| Report | Description |
|---|---|
| HQ | Report with hourmeter |
| HR | Reduced report with hourmeter |
| HV | Event report with hourmeter |