DATA LOGGING & MODBUS REGISTERS FOR THE DE-1500
5/8/03
The following document describes the spacing for the fields of the DE-1500 data logging
command.
This command is functional from the RS-232 and the RS-485 data logging port. The
communications settings are 9600, 8, N and 1. The node number must be correct for the
DE-1500 to respond on the RS-485 port. The node number field is ignored on the RS-232 port
and responds accordingly.
The command to access a particular record is as follows:
>(XX DL YYY)
COMMAND HEADER “>” (0) - ASCII value 3Eh.
BEGIN TEXT “(” (1) - ASCII value 28h.
DE-1500 NODE NUMBER (2-3) - This field consists of the node number associated with the
particular DE-1500. The range is from 01 to 99.
SPACE (4), (7) - ASCII value 20h.
COMMAND (5, 6) - The letters “D” and “L”, which stand for “data log”.
REQUESTED RECORD NUMBER (8-10) -
Table I: This value will be between 001 and 100 and represents the requested record number.
Record number 001 will always contain the most recent data log event. Record number 002
contains the second most recent data log event and so on. Requesting record number 999 gives a
response which occurred due to a first fault condition. If there is no faults and 999 is requested,
the “NO DATA AVAILABLE” message occurs. Requesting record number 000 transmits
current status information.
Table II: Table II shows the structure of data log command 998. This is for the Hourmeter.
END TEXT “)” (11) - ASCII value 29h.
