Omega DPF20 Series User Manual

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DPF20 Frequency, rate, total or period counter Instruction Manual
2.4 Module S4
Opon S4
Output type RS-485 ASCII communicaon port
Bus RS-485
Speed 57.6 Kbps to 600 bps
Data format 8n1 (standard), 8o1, 8n2, 8e1
Protocol ASCII
Architecture ‘master - slave’
Addresses 01 to 31
‘Broadcast’ address 128
Registers see secon 2.4.1
Isolaon 1000 Vdc
Conguraon 3 buon front keypad
Temperature operaon from 0 to 50 ºC
storage from -20 to +70 ºC
Installaon allowed at ‘Opt.1’, ‘Opt.2’, ‘Opt.3’
Module S4 provides 1 RS-485 ASCII communicaons port, to install in
DPF20 digital panel meters. ASCII protocol with ‘master’ - ‘slave’ ar-
chitecture. Addressable up to 31 modules. Frames codied in rep-
resentable ASCII characters (codes 32 to 255), directly visible using
‘hyperterminal’ or similar programs.
Instrument registers are accessible through the RS-485 ASCII port
(reading value, alarm status, memory of maximum and minimum,
setpoint values, ...).
Protocol conguraon is performed from the frontal keypad of the
meter, by seng the parameters at the opons conguraon menu
(‘Opt.1’, ‘Opt.2’ or ‘Opt.3’ depending on the posion the module is
installed).
Up to a maximum of 3 S4 modules can be installed in a single instru-
ment, all modules isolated between them and isolated from all other
circuits.
Modules S4 can be ordered pre-installed into a DPF20 digital panel
meter, or standalone for delayed installaon, as they do not require
soldering or special conguraon.
Module Connecons
Module S4 - RS-485 ASCII
Terminal B B signal from RS-485 bus
Terminal A A signal from RS-485 bus
Terminal G GND
Table 13 - Connecon terminals
Power
Opt.2
Opt.1
Opt.3
B A G
B A G
Signal
B A G
Rear view DPF20
2.4.1 Accessible registers
Register Name Descripon
0 DISPLAY1 Display1 value
1 MAXMEM Memory of maximum
2 MINMEM Memory of minimum
3 AL1 Setpoint 1 value
4 AL2 Setpoint 2 value
5 AL3 Setpoint 3 value
6 STATUS Alarm status
Table 14 - Accessible registers for ASCII protocol.
Register 0 - DISPLAY1
Contains the display value of the instrument, in ASCII code, including
polarity (posive / negave) and decimal point.
Example 1 R0=’+’ ‘0’ ’6’ ‘5’ ‘4’ ‘3’ ‘.’ ‘2’
Display value = 6543.2
Example 2 R0=’-’ ‘0’ ‘0’ ‘0’ ‘4’ ‘.’ ‘5’ ‘2’
Display value = -4.52
Display values (DISPLAY1, MAXMEM, MINMEM, AL1, AL2, AL3) are
codied with a minimum of 6 digits (le zeros are added if neces-
sary), polarity and decimal point.
Register 1 - MAXMEM
Contains the value for memory of maximum, in ASCII code, including
polarity (posive / negave) and decimal point.
Register 2 - MINMEM
Contains the value for memory of minimum, in ASCII code, including
polarity (posive / negave) and decimal point.
Register 3 - AL1
Contains the value for alarm 1 setpoint, in ASCII code, including po-
larity (posive / negave) and decimal point.
Register 4 - AL2
Contains the value for alarm 2 setpoint, in ASCII code, including po-
larity (posive / negave) and decimal point.
Register 5 - AL3
Contains the value for alarm 3 setpoint, in ASCII code, including po-
larity (posive / negave) and decimal point.
Register 6 - STATUS
Contains the alarm status (on/o).
Bit 0 Alarm 1 status (0 = inacve, 1 = acve)
Bit 1 Alarm 2 status (0 = inacve, 1 = acve)
Bit 2 Alarm 3 status (0 = inacve, 1 = acve)
Bit 3 to 15 Reserved

Omega DPF20 Series Specifications

General

Brand	Omega
Model	DPF20 Series
Category	Measuring Instruments
Language	English