Delta OHM HD35AP series, Руководство по эксплуатации

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HD35
- 100 -
V1.12
12 MODBUS
In MODBUS communication the base unit works as a multiplexer (i.e., as an interface) to address
MODBUS commands from PC/PLC to wireless network devices. That means that the address of a
wireless device (for ex. a data logger) which is not physically connected to the RS485 (MOD-
BUS-RTU) or LAN (MODBUS TCP/IP) network can be added to the MODBUS command: the base
unit, physically connected to the RS485 or LAN network, will intercept the command and will send
it to the interested wireless device. The wireless device will execute the command and reply to the
base unit; this will send back the reply to the PC/PLC. In order for a wireless device to be ad-
dressed successfully, devices with the same MODBUS address as that of wireless devices should
not be present in RS485 or LAN network.
The device general information can be read through the function code 0x2B/0x0E. It consists
of:
•
Manufacturer (Delta OHM)
•
Model
•
Firmware version
The complete list of MODBUS registers is shown below. According to the device model, some of
the listed registers could not be present if not significant for that particular model (for ex., CO
2
measurement will not be available if it is not measured by the data logger). If you try to read a
register that is not present, the instrument returns the fixed value 32767. In case of doubt on
the registers actually available in a particular model, use the function " Download the list of
MODBUS registers of the device " included in the Settings sections of HD35AP-S software (see
software instructions).
The following conventions have been used in the tables:
o
AP = base unit, ED = data logger, RE = repeater, AL = alarm module
AP, ED, RE, AL columns indicate the device where the parameter is available.
o
Type: b = bit, B = 8 bits (Byte), W = 16 bits without sign (Word), SW = 16 bits with sign
o
(x10) = decimal value expressed as an integer (e.g., if the content of the register is 184,
the value is to be intended as 18,4).
o
(x100) = centesimal value expressed as an integer (e.g., if the content of the register is
500, the value is to be intended as 5,00).
The commands for requesting units of measurement return an index according to the corre-
spondence indicated in the table below:
TAB. 12.1: indexes of the units of measurement
Index Unit of
meas.
Index Unit of
meas.
Index Unit of
meas.
Index
Unit of
meas.
Index
Unit of
meas.
0 °C 12 mmH
2
O 24 Wh/m 2 36 m 2 /s 48 dB
1 °F 13 inchHg 25 kWh/m 2 37 g (*) 49 dBA
2 %UR 14 inchH
2
O 26 J/m 2 38 mm 50 kWh
3 g/m 3 15 kgf/cm 2 27 µJ/cm 2 39 inch 51 l/s
4 g/kg 16 PSI 28 V 40 Counts 52 l/min
5 mbar 17 m/s 29 mV 41 mm/h 53 gallon/min
6 bar 18 km/h 30 mA 42 inch/h 54 m 3 /min
7 Pa 19 ft/s 31 ppm 43 counts /h 55 m 3 /h
8 hPa 20 mph 32 Hz 44 mW/m 2 56 µmol/(m 2 s)
9 kPa 21 knot 33 % 45 m
10 atm 22 W/m
2
34 degrees 46 s
11 mmHg 23 µW/cm
2
35 lux 47 µW/lumen 255 Not
defined
(*) Gravity acceleration