User Manual, Firmware rev. 3.0 or LATER Owner's manual

66 Publication 1404-UM001F-EN-P - November 2009
Chapter 4 Communication
The RS-232 communication standard supports point-to-point
communication between TWO stations or nodes, with a maximum
cable length of 15.24 m (50.0 ft). You may not use the optional RS-232
port and the native RS-485 port at the same time.
Optional RS-232 Communication Configuration Summary
Parameter Description Range Default User
Setting
Port Select active serial port RS-232
RS-485
RS-232
Protocol DF1 Full-duplex
DF1 Half-duplex
Slave
Modbus RTU
Slave
Auto-Sense
Auto-Sense
Delay Time between receiving a
request and transmitting
a response
0…75 ms 10 ms
Communication
Rate
RS-485 port
communication bit rate
1.2 Kbps
2.4 Kbps
4.8 Kbps
9.6 Kbps
19.2 Kbps
38.4 Kbps
57.6 Kbps
9600 baud
Node Address Uniquely identifies the
Powermonitor device on
a multi-drop network
1…247 Unit ID
number
Data Format Data bits / Stop bits /
Parity
8 / 1/ none
8 / 1/ even
8 / 1/ odd
8 / 1 / none
Flow Control
(Handshaking)
RS-232 hardware flow
control
0 - none
1 - RTS/CTS
0 - none
Inter-Character
Timeout
Mimimum delay between
characters that indicates
end of Modbus message
packet
0 to 6553 ms 0 (= 3.5
character
times)
Error Checking BCC, CRC CRC