Downlink Command

This chapter describes the downlink commands for device configuration and control. The downlink application port is 85 by default.

General Setting

Item Channel Type Byte Description
Reboot ff 10 1 ff
Collect Interval ff 02 2 UINT16, Unit: s
Re-collect Setting ff 1c 2 Byte 1: re-collect times

Byte 2-3: re-collect interval
Report Interval ff 03 2 UINT16, Unit: s
Data Storage ff 68 1 00: Disable, 01: Enable
Data Retransmission ff 69 1 00: Disable, 01: Enable
Data Retransmission Interval ff 6a 3 Byte 1: 00

Byte 2-3: UINT16, Unit: s, Range: 30~1200, Default: 600
UTC Time Zone ff 17 2 INT16/10
Device Time ff 11 4 Unix timestamp, Unit: s
Sync with with LNS ff 4a 1 ff
Example:
  1. Reboot the device.
    ff10ff
  2. Set collect interval as 20 minutes.
    ff02b004
    Channel Type Value
    ff 02 b004=>04b0=1200s=20 minutes
  3. Set report interval as 20 minutes.
    ff03b004
    Channel Type Value
    ff 03 b004=>04b0=1200s=20 minutes
  4. Set time zone as UTC-2.
    ff17ecff
    Channel Type Value
    ff 17 ecff=>ff ec=-20/10=-2

Calibration Setting

Item Channel Type Byte Description
Depth Calibration ff f1 4 Byte 1: 06

Byte 2: 00-disable, 01-enable

Byte 3-4: Calibration value, INT16, Unit: cm
Examples:
  1. Enable depth calibration and set calibration value.
    fff10601fdff
    Channel Type Value
    ff f1 06=Depth, 01=Enable

    fdff=>fffd=-3 cm

Threshold Setting

Item Channel Type Byte Description
Depth Threshold Alarm ff 06 9 Byte 1: 08=Disable, 49=Below (min. threshold), 4a=Over (max. threshold), 4b=Within, 4c=Below or over

Byte 2-3: Minimum threshold, UINT16, Unit: cm

Byte 4-5: Maximum threshold, UINT16, Unit: cm

Byte 6-9: 00000000
Alarm Reporting Times ff f2 2 UINT16
Alarm Dismiss Report ff f5 1 00-disable, 01-enable
Example:
  1. Set the depth threshold as below 1m.

    ff06496400000000000000
    Channel Type Value
    ff 06 49=Below

    Min. threshold: 64 00=>00 64=100 cm=1m