User Manual, PRIOR to Firmware rev. 3.0 Owner manual

Publication 1404-UM001D-EN-E - October 2004
Communications 4-3
Optional RS-232 Communications
Powermonitor 3000 units with a catalog number ending in “-232” are
equipped with an optional RS-232 serial port in addition to the native
port. These units are set up at the factory to communicate using the
optional port using the Allen-Bradley DF1 half-duplex slave protocol.
The configuration parameters are:
• Protocol: Allen-Bradley DF1 half-duplex slave, Modbus RTU
slave, auto-sense. Default auto-sense.
• Data rate: Range 1200, 2400, 4800, 9600, 19,200 baud. Default
9600
• Delay: Range 0 to 75 mS, 10 mS default
• Node address: Range 1 to 247, default is unit ID listed on
nameplate
• Data Format: 8 data bits, 1 stop bit, no parity or even parity.
Default no parity
Table 4.1 Native Communication Configuration Summary
Parameter Description Range Default User
Setting
Protocol DF1
Half-Duplex
Slave
Modbus RTU
Slave
Auto-Sense
Auto-Sense
Delay Time between receiving
a request and
transmitting a response
0 to 75 mS 10 mS
Baud Rate RS-485 port
communications bit rate
1200 baud
2400 baud
4800 baud
9600 baud
19200 baud
9600 baud
RS-485 Address Uniquely identifies the
Powermonitor device on
a multi-drop network
1 to 247 Unit ID number
Data Format Data bits / Stop bits /
Parity
8 / 1/ none
8 / 1/ even
8 / 1/ odd
8 / 1 / none
Inter-Character
Timeout
Mimimum delay
between characters that
indicates end of Modbus
message packet
0 to 6553 ms 0 (= 3.5
character times)