NOVUS FieldLogger Register - Manual (Page 5)

FieldLogger Register
NOVUS AUTOMATION 5/8
SERIAL COMMUNICATION
The logger has a master-slave asynchronous serial communication
interface RS485 to communicate with a supervisory computer
(master). The logger is always the slave.
Communication always start with the master, which sends a
command to the slave address with whom it wants to communicate.
The addressed slave undertakes the command and sends the
corresponding answer to the master.
The logger also accepts broadcast commands.
Note: Recommended cables for serial communication are 3 x 24
AWG + shield. This way the shield can be grounded while cables are
used for signals.
FEATURES
Signals supported by RS485 standard. We recommend reading the
document “Basic concepts of RS485 and RS422” available in the CD
that is delivered with the equipment.
Communication signals are electrically isolated from the rest of the
device, with configurable speed of 1200, 2400, 4800, 9600, 19200
and 57600 bps.
Number of data bits: 8.
Parity: none, odd or even.
Number of stop bits: 1 (odd or even parity) or 2 (no parity).
Response delay: up to 20 ms after command is received.
Protocol: Modbus RTU, available in most supervisory software of the
industry.
RS-485 signals are:
D1 D D+ B Bidirectional data line Terminal 17
D0 D: D- A Reversed bidirectional data
line
Terminal 18
C
GND
Optional connection that
enhances
the
communication performance
Terminal 16
PHYSICAL SPECIFICATIONS
• Three-wire connection (2 data wires and 1 common) between 1
master and up to 247 instruments (maximum of 31 per network
segment) in bus topology.
• Shielded cable, 3 x 24 AWG, with shield grounded in one end;
• 16 pF capacitance at every 30 m;
• Typical impedance: 120 Ohms;
• Maximum length 1200 m;
REGISTERS
The logger configurable parameters are organized in a Table of
Registers. The block reading command makes possible to read
multiple registers with the same request.
The configuration software, however, makes such table not
necessary, once it reads and writes in all registers that require
configuration. Each parameter in the table is a word of 16 bits.
The available Modbus command for the reading operation is the
following:
03 - Read Holding Register
This way, it is worth reporting the following registers, which are
equivalent to the holding registers (reference 4X):
HOLDING
REGISTERS
DESCRIPTION
0000 Current value of channel 1
0001 Current value of channel 2
0002 Current value of channel 3
0003 Current value of channel 4
0004 Current value of channel 5
0005 Current value of channel 6
0006 Current value of channel 7
0007 Current value of channel 8
0008 Informs alarm status
0009 Reserved: Informs general status
0010 Informs channels 1 and 2 status
0011 Informs channels 3 and 4 status
0012 Informs channels 5 and 6 status
0013 Informs channels 7 and 8 status
0014 Current time (seconds and minute)
0015 Current time (hour and day)
0016 Current time (month and year)
0017 Channel 1 configuration
0018 Channel 2 configuration
0019 Channel 3 configuration
0020 Channel 4 configuration
0021 Channel 5 configuration
0022 Channel 6 configuration
0023 Channel 7 configuration
0024 Channel 8 configuration
0076 Bytes 0 and 1 of the title string
0077 Bytes 2 and 3 of the title string
0078 Bytes 4 and 5 of the title string
0079 Bytes 6 and 7 of the title string
0080 Bytes 8 and 9 of the title string
0081 Bytes 10 and 11 of the title string
0082 Bytes 12 and 13 of the title string
0083 Bytes 14 and 15 of the title string
0084 Bytes 0 and 1 of channel 1 string (tag)
0085 Bytes 2 and 3 of channel 1 string (tag)
0086 Bytes 4 and 5 of channel 1 string (tag)
0087 Bytes 6 and 7 of channel 1 string (tag)
0088 Bytes 0 and 1 of channel 2 string (tag)
0089 Bytes 2 and 3 of channel 2 string (tag)
0090 Bytes 4 and 5 of channel 2 string (tag)
0091 Bytes 6 and 7 of channel 2 string (tag)
0092 Bytes 0 and 1 of channel 3 string (tag)
0093 Bytes 2 and 3 of channel 3 string (tag)
0094 Bytes 4 and 5 of channel 3 string (tag)
0095 Bytes 6 and 7 of channel 3 string (tag)
0096 Bytes 0 and 1 of channel 4 string (tag)
0097 Bytes 2 and 3 of channel 4 string (tag)
0098 Bytes 4 and 5 of channel 4 string (tag)
0099 Bytes 6 and 7 of channel 4 string (tag)
0100 Bytes 0 and 1 of channel 5 string (tag)
0101 Bytes 2 and 3 of channel 5 string (tag)
0102 Bytes 4 and 5 of channel 5 string (tag)
0103 Bytes 6 and 7 of channel 5 string (tag)