Rockwell Automation 1408-EMxx PowerMonitor 1000 Unit - Manual (Page 29)

Rockwell Automation Publication 1408-UM001D-EN-P - September 2013 29
PowerMonitor 1000 Unit Features Chapter 2
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.
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) 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
38.4k
RS-485 Address Uniquely identifies the power monitor on a
multi-drop network
1…247
0…31 (3)
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
(1) Delay, Inter Character Timeout parameters have no effect on DH485 protocol
(2) The baud-rate setting for DH485 should be 9600 or 19.2 k
(3) DH485