LC Report
LC Report - Locator (Cell mode)
The protocol defines a cell-based location mode (Locator), but in this firmware version position acquisition for the LC report is disabled: SLCX does not trigger any real query and, if an LC report is generated, it arrives with latitude and longitude at zero.
In the current firmware, SLCX does not initiate any location query: it only validates that the following character is X and responds with the fixed literal RLCXOK. The line that would trigger the actual cell-based position capture is commented out in the code, so there is no effective GSM triangulation in this version.
Send the SLCX command
SLCXThe device validates that the character after SLC is X and immediately responds with a fixed OK, without initiating any position query.
Response
RLCXOKIt is a fixed literal: it does not include position data or any other field.
LC report format
RLCbbAAAAAABBBBBBCCCCCCCCDDDDDDDDDEEReal example (position at 0 because in this version the acquisition via LOCATOR is commented out):
RLC00291224153045-2778467-0642565802Report fields
| Field | Description |
|---|---|
| bb | Report number / IdRpt (hex) |
| AAAAAA | Date (DDMMAA) |
| BBBBBB | Time (HHMMSS) |
| CCCCCCCC | Latitude (±DDMMMMM); in this version it stays at 0 because position acquisition via LOCATOR is commented out |
| DDDDDDDDD | Longitude (±DDDMMMMM); same reason |
| EE | Differential time (hex, seconds) |
There are no speed, heading, input/output status, event number, or message number fields in the actual LC frame.
The EE field is the standard differential time field found in position reports (same as in CY/GP), not a measurement of how long the SLCX query took.
Available signals
| Signal | Description |
|---|---|
| LC00+ | A new cell position was received |
| LC01+ | A new server response was received |
Example usage with rule
>SRL10E;TRG=LC00+;ACC={GCY10H}<When a cell position is obtained (LC00+), sends a high priority CY report.
Considerations
| Aspect | Detail |
|---|---|
| Precision | Not available: cell-based position acquisition is disabled in the current firmware (position always at 0) |
| Availability | SLCX responds RLCXOK but does not trigger any real query |
| Consumption | Lower than GPS (once implemented) |
| Latency | Higher than GPS (once implemented) |
Compatibility
Locator mode is intended as a backup for when the device loses GPS signal for an extended period (underground parking lots, closed containers), but in this firmware version position acquisition is commented out: don’t rely on it as a real backup until that functionality is active.