Installation guide

LMU Users Guide

V1.0.6 December 10 2009

- 86 - CalAmp Proprietary & Confidential

11.1.5 SMS Comm Status Message

The Comm Status Message allows users to remotely poll the LMU for its current wireless

modem status and settings via SMS. The message is formatted as follows:

M:[O/C/E][./s][./r] <Maint URL> <Maint Port>

I:[O/C/E][./s][./r] <Inbound URL> <Inbound Port>

O:[O/C/E][./s][./r] <Outbound URL> <Outbound Port>

o <RSSI>:

This is the signal strength the wireless modem sees from the network. In

general the LMU is at least scanning for the network if the RSSI is not -113.

o [./d/D]:

If the character ‘D’ is present, it indicates the LMU had a data session

established when it responded to the status request. For the 8-Bit product

line an upper case ‘D’ indicates both the Inbound and Maintenance sockets

are ready. The lower case ‘d’ indicates that only the Maintenance socket is

ready. A ‘.’ indicates no sockets are ready.

o [./a/A]:

This field indicates if the LMU has received an Acknowledgement from the

Inbound server. This field will be empty if the LMU has never received an

ACK.The lower case ‘a’ will be present if it has received an ACK since the

last cold boot (i.e. power cycle) but not the last warm boot (App Restart or

Sleep). The upper case ‘A’ will be present if the LMU has received an ACK

since the last warm boot. A ‘.’ Indicates no acknowledgement has been

received.

o [./L]:

This field indicates if the LMU’s log is currently active. An ‘L’ indicates that

the log is currently in use (i.e. one or more records have been stored) where a

‘.’ indicates the log is inactive.

o <IP Address>:

This is an optional field if and is only present if the LMU has established a

valid data session. This field will contain the current IP address of the LMU

as assigned by the wireless network. Note that if you see a value of

192.168.0.0, this is an indication that the LMU has not been able to establish

a data session.

o <Local Port>:

This field contains the current Local Port Number in use by the LMU.

Typically this value is set to 20510 via Parameter 774.

• M/I/O:

The first character of each line indicates which socket the status indicates apply to.

The three lines are M = Maintenance Socket, I = Inbound Socket, O = Outbound

Socket.

o [O/C/E]:

This field indicates the current status of the referenced socket. The three

possible states are, OPEN (O), CLOSED (C) or ERROR (E).