N1040i Indicator
Communication Protocol – V10x
1.1 COMMUNICATION INTERFACE
The optional serial interface RS485 allows to address up to 247
indicators in a network communicating remotely with a host computer
or master indicator.
RS485 Interface
• Compatible line signals with RS485 standard
• 2 wire connection from master to up to 31 slaves indicators in a
multidrop bus. It is possible address 247 nodes with multiple
outputs converters.
• Maximum communication distance: 1000 meters
• The RS485 signals are:
D1 = D: Bidirectional data line.
D0 =
Bidirectional inverted data line.
C = GND: Optional connection which left communication
better.
General Characteristics
• Optically isolated serial interface
• Programmable baud rate: 1200, 2400, 4800, 9600, 19200,
38400, 57600 or 115200 bps.
• Data Bits: 8
• Parity: None, Even or Odd.
• Stop Bits: 1
Communication Protocol
The MOSBUS RTU slave is implemented, available in most SCADA
softwares in the market.
All configurable parameters can be accessed (for reading or writing)
through the Registers Table. Broadcast commands are supported as
well (address 0).
The available Modbus commands are:
03 - Read Holding Register
05 - Force Single Coil (Force Digital Output state)
06 - Preset Single Register
16 - Preset Multiple Registers (Block write to multiple holding
registers)
The registers are arranged in a table in such a way that several
registers can be read in the same request.
1.2 CONFIGURATION OF SERIAL COMMUNICATION
PARAMETERS
Two parameters must be configured in the device for serial
communication:
: Baud rate. All devices with same baud rate.
: Device communication address. Each device must have an
exclusive address.
: Paraty.
1.3 REGISTERS TABLE
Equivalent to the registers referenced as 4XXXX.
The holding registers are basically a list of the internal indicator
parameters. All registers above address 12 can be read or written. The
registers up to this address in more are read only. Please verify each
case. Each table parameter is a 16 bits two complement signed word.
Holding
Registers
Parameter
Register Description
0000
Diferential alarm reference..
Range:
to
(or the sensor span),
0001 PV
Read: Process Variable.
Write: Not allowed.
In case of temperature reading, the value read
is always multiplied by 10, indepen
value.
0002 Reserved Internal use
0003 Reserved Internal use
0004
Display
value
Read: Current value shown on display.
Write: Current value shown on display.
Range: -1999 to 9999. The range depends on
the displayed parameter.
0005
Prompt
index
Read: Current prompt position in the parameters
flowchart.
Write: not allowed.
Range: 0000h to 060Ch
Prompt number format: XXYYh, where:
XX→ menu cycle number
YY→ prompt number (index)
0006
Status Word
1
Read: Status bits. See table 2.
Write: not allowed.
0007
Software
Version
Read: The firmware version of indicator
V1.00, the read value will be 100.
Write: not allowed.
0008 ID
Read: indicator identification number: 68
Write: not allowed.
0009
2
Read: Status bits. See table 2.
Write: not allowed.
0010
3
Read: Status bits. See table 2.
Write: not allowed.
~0015
Reserved Internal use.
0016
Mains frequency.
0→ 60 Hz;
1→ 50 Hz;
0017 Reserved
0018
PV digital filter gain.
Range: 0 – 20
0019 Reserved Internal use.
0020
Controls the presence of the parameter SPA1 in
the indicator operation cycle.
0→ Disables (hides SPA1);
1→ Enables (shows SPA1);
0021
Controls the presence of the parameter SPA2 in
the indicator operation cycle.
0→ Disables (hides SPA2);
1→ Enables (shows SPA2);
0022 Reserved Internal use.
0023
Serial
number H
Serial number first four digits.
Write: no allowed.
Read: 0 to 9999.
0024
Serial
number L
Serial number last four digits.
Write: no allowed.
Read: 0 to 9999.
0025 Reserved Internal use.
0026
Defines the minimum PV indication value for
analog input types (used to scale the analog
inputs).
0027
Defines the indication higher limit of the PV
indication (used to scale the analog inputs).
0028 Reserved Internal use.
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(2 paginas)
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