file: blogr24_ops.html
16 May 2012

BLOGR24 OPERATIONS

The BLOGR24 normally operates in RS232 console mode. (It may be switched to RS485 console mode by moving the Power/Comms cable from connector P11 to P12 and using a suitable RS485 converter with your PC - see RS485 note below as well).

Refer to MET BLOGR24 Commands - NTAS with SDHC and external Iridium Support for full command descriptions.


Getting Started

Individual ASIMET modules may be connected and disconnected while the BLOGR24 logger is running. Each minute, as modules are polled, missing modules are flagged, and the STAT command will report comms failures during all but the final 15 seconds of the logging interval (see RI setting, typically 60 seconds). For example, if there is no response from the PRC module when the BLOGR24 logger polls, the STAT command will report "PRC failure" in its output message for the next 45 seconds; power to the module is also turned OFF during this time, and 15 seconds before the end of the interval, it is restored. Hopefully the module recovers for this next cycle; note that modules DO NOT produce "good" data values until they rollover their internal 60-second sampling intervals; thus, for example, a WND module will respond the first minute after it is connected to the BLOGR24 logger (so there will be no failure message for the next minute) but will not have good data until the next minute. This is normal; ALL ASIMET modules operate asynchronously on their individual internal real-time clocks.


Communications

The BLOGR24 (like ASIMET) has a communications protocol based on the SAIL (Serial ASCII Interface Loop) protocol developed at Oregon State University. The module is interrogated by sending commands with the following format (always with capital letters and terminated with a RETURN <cr>):

#STAT<cr>

The STAT or STATD command will display several lines of status info about the instrument. Note that unlike the ASIMET and VMCM2 series instruments, the BLOGR24 software does not use SAIL Addresses currently, just the preceding # character, and always a terminating RETURN (ASCII carriage return <cr>)

On power up, the BLOGR24 logger will always come up running and logging as last configured (the STAT or STATD command will indicate Sampling GO when the BLOGR24 logger is running).

NOTE that only a subset of the commands is available while the LOGR53 logger is running. The H command will indicate which commands are available depending upon the GO / STOPPED state of the BLOGR24 logger.

Refer to MET BLOGR24 Commands document for full command descriptions.


Deployment Quick Start

For the complete discussion of BLOGR24 system preparation for deployment, refer to the LOGR53-CF System Prep document.   While this document refers to the older LOGR53-CF logger, most of the information is valid, since the BLOGR24 is a drop-in replacement for the older logger.

The important steps are:


RS232 to RS485 converters