4–8
EPM 4
5
00 SUB METER – INSTRUCTION MANUAL
MODBUS ACTIVATION
CHAPTER 4: COMMUNICATIONS
4.2.6
Changing Modbus Settings
Use the following procedure to change the Modbus address setting:
Z
Enter the following command to set the Modbus address:
attn -p
#
where
#
is replaced by the actual address desired (for example,
attn -p100
).
Z
Save the Modbus address as follows
attn -W1234
Z
Enter the following command to display and verify the Modbus
address:
attn -d
This command displays the meter serial number and the poll/Modbus
number.
4.2.7
Logging Out
Z
Use one of the following commands to logout of the meter:
attn
or
exit
Note
Once Modbus is set, it is best to type [HALT] followed by [ENTER] or cycle power to the
meter. Otherwise, Modbus will become active one minute after logout.
To log into meter once Modbus is active, use hot keys to program the login sequence. The
login sequence must include either the serial number or the Modbus address.
Example hot key sequences are shown below:
attn -S60005866 -3Super3
attn 256 -3Super3
4.2.8
Disabling Modbus Communications
Use the following procedure to disable Modbus communications:
Z
Turn off Modbus with the following command:
stty -M0
Z
Save Modbus settings:
stty -W1234
