1
N1200
Communication Protocol – V10x
1. SERIAL COMMUNICATION
1.1 COMMUNICATION INTERFACE
The optional serial interface RS485 allows to address up to 247 controllers in a
network communicating remotely with a host computer or master controller.
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 =
D:
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:
bavd
bavdbavd
bavd
: Baud rate. All devices with same baud rate.
addr
addraddr
addr
: Device communication address. Each device must have an exclusive
address.
prty
prtyprty
prty
: 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 Active SP Read: Active control SP (main SP, from ramp and soak or
from remote SP).
Write: to main SP
Range: from spll
spllspll
spll to spkl
spklspkl
spkl.
0001 PV Read: Process Variable.
Write: Not allowed.
Range: Minimum value is the one configured in
spll
spllspll
spll and
the maximum value is the one configured in spkl
spklspkl
spkl. Decimal
point position depends on dppo
dppodppo
dppo value.
In case of temperature reading, the value read is always
multiplied by 10, independently of dppo
dppodppo
dppo value.
0002 MV Read: Output Power in automatic or manual mode.
Write: Not allowed. See address 28.
Range: 0 to 1000 (0.0 to 100.0%).
0003 Remote
SP type
Read/Write: Selected input type for remote SP.
Range: 0 to 3
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 (check item 4 -
INSTALLATION/CONNECTIONS)
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 controller. If V1.00, the read
value will be 100.
Write: not allowed.
0008 ID Read: controller identification number.
Write: not allowed.
Values:
1 – N1100; 2 - N2000; 3 - N1500; 48 - 1200
Other values: special instruments.
0009
2
Read: Status bits. See table 2.
Write: not allowed.
0010
3
Read: Status bits. See table 2.
Write: not allowed.
0011
Ir
IrIr
Ir
Integral Rate (in repetitions/min)
Range: 0 to 9999 (0.00 to 99.99)
0012
D
DD
Dt
tt
t
Derivative Time (in seconds). Range: 0 to 3000 (0.0 to
300.0)
0013
P
PP
Pb
bb
b
Proportional Band (in percentage)
Range: 0 to 5000 (0.0 to 500.0)
0014
tbas
tbastbas
tbas
Read/Write: Time base for the ramp and soak programs.
Range: 0 – 1 (seconds/minutes)
0015
C
CC
Ct
tt
t
Cycle Time (PWM, in seconds)
Range: 5 to 1000 (0.5 to 100.0)
0016
Freq
FreqFreq
Freq
Read/Write: Mains frequency.
Range: 0 – 1 (60/50Hz)
0017
kyst
kystkyst
kyst
On/Off Control Hysteresis (in selected type engineering
unit).
Range: 0 to spkl
spklspkl
spkl -
spll
spllspll
spll
0018
fltr
fltrfltr
fltr
Read/Write: PV digital filter gain.
Range: 0 – 20
0019
ovll
ovllovll
ovll
Output Low Limit (minimum output power)
Range: 0 to 1000 (0.0 to 100.0%).
0020
ovkl
ovklovkl
ovkl
Output High Limit (minimum output power)
Range: 0 to 1000 (0.0 to 100.0%).
0021
AvEn
AvEnAvEn
AvEn
N2000 only.
Auto/Man key Enable –
.
1 Key enabled 0 Key disabled
0022
f.fvnc
f.fvncf.fvnc
f.fvnc
N2000 only.
F key function.
0 Not used. 7 Controller start/stop.
8 Select remote SP. 9 Ramp and soak hold.
10 Enable ramp and soak profile 1.
0023 Serial
number H
Serial Number High (Upper display).
Range: 0 to 9999. Read only
0024 Serial
number L
Serial Number Low (Lower display).
Range: 0 to 9999. Read only
0025 SV Control Setpoint (Prompt Setpoint).
Range: from spll
spllspll
spll to spkl
spklspkl
spkl.
0026
spll
spllspll
spll
Setpoint Low limit.
Range: minimum value depends on the input type selected
in type
typetype
type (see Table 1) to spk
spkspk
spkl
ll
l.
0027
spkl
spklspkl
spkl
Setpoint High limit.
Range: minimum value is spll
spllspll
spll and maximum depends on
the input type selected in type
typetype
type (see Table 1).
0028 Reserved Internal use.
0029
offs
offsoffs
offs
PV offset
Range: from spll
spllspll
spll to spkl
spklspkl
spkl
.
0030
dppo
dppodppo
dppo
PV decimal point position
Range: 0 to 3
0→0.000; 1→00.00; 2→000.0; 3→0000
0031
Sp.a1
Sp.a1Sp.a1
Sp.a1
Alarm 1 Setpoint.
Range: The minimum value is at spll
spllspll
spll for non-differential
alarm or spll
spllspll
spll - splk
splksplk
splk for differential alarm
The maximum value is at spkl
spklspkl
spkl for non-differential alarm or
at spkl
spklspkl
spkl - spll
spllspll
spll for differential alarm.
0032
Sp.a2
Sp.a2Sp.a2
Sp.a2
Alarm 2 Setpoint. Range: same as in spa1
spa1spa1
spa1.
0033
Sp.a3
Sp.a3Sp.a3
Sp.a3
Alarm 3 Setpoint. Range: same as in spa1
spa1spa1
spa1.
0034
Sp.a4
Sp.a4Sp.a4
Sp.a4
Alarm 4 Setpoint. Range: same as in spa1
spa1spa1
spa1.
0035
Fva1
Fva1Fva1
Fva1
Alarm 1 Function. Range: 0 to 8
0→off
offoff
off; 1→ierr
ierrierr
ierr; 2→rs
rsrs
rs; 3→rfai
rfairfai
rfai;
4→lo
lolo
lo; 5→ki
kiki
ki; 6→difl
difldifl
difl; 7→difk
difkdifk
difk;
8→dif
difdif
dif.
0036
Fva2
Fva2Fva2
Fva2
Alarm 2 Function. Range: same as in fua1
fua1fua1
fua1.
0037
Fva3
Fva3Fva3
Fva3
Alarm 3 Function. Range: same as in fua1
fua1fua1
fua1.
0038
Fva4
Fva4Fva4
Fva4
Alarm 4 Function. Range: same as in fua1
fua1fua1
fua1.
0039
Kya1
Kya1Kya1
Kya1
Alarm 1 Hysteresis. Range: 0 to 9999 (0.00 to 99.99%)
(10 pages)
(9 pages)
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