Specifications

Channel Master Operation Manual
page 82 Teledyne RD Instruments
10.9 Timing Commands
The following commands let you set the timing of various profiling func-
tions.
>T?
Available Commands:
TD 00:20:00.00 ---------- SDI-12 Watchdog timer reset
TE 00:00:05.00 ---------- Time Between Ensembles
TF 00/00/00,00:00:00 ---- Set First Ping Time (yy/mm/dd,hh:mm:ss)
TP 00:00.60 ------------- Time Between Pings
TS 06/01/24,10:45:57.95 - Set System Date and Time (yy/mm/dd,hh:mm:ss)
06/01/24,10:45:57.95 - Stored Time
T? ---------------------- Display T-Command Menu
10.9.1 Standard Timing Command Descriptions
This section lists the Timing commands.
TD – Built-In Watchdog Timer
Purpose: Sets the reset time period (TD) from the user-entered time on
the command line. The user must enter the TD time as eight
digits, with or without delimiters.
Format: TDhh:mm:ss.ff (acceptable formats include: TDhhmmssff,
TDhh:mm:ss.ff, or TDhh mm ss ff)
Range: hh = 00 to 23 hours
mm = 00 to 59 minutes
ss = 00 to 59 seconds
ff = 00 to 99 hundredths of seconds
Default: TD00:20:00.00
Recommended Setting. Set TD to a duration longer than the SDI-12
measurement interval. Do not set it close to the actual SDI-12 measurement
interval as this could possibly cause unwanted resets just at the time the
next measurement request is occurring.
Description: If the Channel Master fails to respond to an SDI-12 measure-
ment request, the TD command will reset the Dual UART cir-
cuitry in the Channel Master. This will allow the Channel
Master to continue responding to subsequent measurements
although the last missed request will be lost.
The TD command should be set to an interval that’s a few
minutes longer than the expected time between SDI-12 meas-
urements. If the SDI-12 measurement interval is 15 minutes,
set the TD value to 20 to 25 minutes; do not set the timer to 15
minutes.