44 PowerMonitor 1000 Unit
Rockwell Automation Publication 1408-IN001E-EN-P - September 2013
RS-485 Communication
This function applies to all models.
Setup
Your power monitor is set up to communicate via its RS-485 port using a default set of
parameters when you first apply power.
DH-485 protocol is supported in firmware FRN 2.0 and higher. If DH-485 is selected, the data
format is automatically set to 8 / 1 / even. Recommended data rates for DH-485 are 9600 and
19.2k.
Error checking method is Cyclic Redundancy Check (CRC). All devices on a multi-drop
RS-485 network must be set at the same data rate and each must be assigned a unique network
address.
Optional Ethernet Network Communication
The power monitor supports simultaneous operation of the optional Ethernet network and
serial ports.
Parameter Description Range Default User Setting
Protocol Setting DF1 Half-duplex Slave
DF1 Full-duplex
Modbus RTU Slave
Auto Sense
DH485
DF1 Full-duplex
Delay
(1)
(1) Delay, Inter Character Timeout parameters have no effect on DH485 protocol
Time between receiving a request
and transmitting a response
0…75 ms 10 ms
Baud Rate Communication bit rate per second 1200, 2400, 4800, 9600
(2)
,
19.2k
(2)
, 38.4k, 57.6k
(2) The baud-rate setting for DH485 should be 9600 or 19.2 k
38.4k
RS-485 Address Uniquely identifies the power
monitor on a multi-drop network
1…247
0…31
(3)
(3) DH485
Unit ID number
Data Format Data bits / stop bits / parity 8 / 1 / none
8 / 1 / even
(3)
8 / 1 / odd
8 / 1 / none
Inter Character
Timeout
(1)
Minimum delay between characters
that indicates the end of a Modbus
message packet
0…6553 ms 0 = 3.5 character
times
Max Node
Address
(3)
1…31 31
