• Values formatting - Modbus code : 1440 (channel 1)
1444 (value 1 for the external transmitter)
1448 (value 2 for the external transmitter)
Page 3
2. Modbus parameters
2.a - Configuration parameters
• Communication speed.....................19200 Bauds (see page 22 to configure the speed)
• Data bits.................................8 bits
• Stop bit..................................1 bit
• Parity....................................None
• Flow control.............................None
• Transmitter addressing.................between 1 and 255
default address “0” for single ended bus configuration
To change the addressing, see page 8.
2.b - Functions
• Register reading ...................................Function 03
• Register writing...............................Function 16
• Communication loop test.....................Function 08
2.c - Access codes to Registers
• Registers type .....................................Signed long integer (32 bits), permuted (LSB, MSB)
• Alarms status - Modbus code : 1436
Relay 1
Relay 2
0101
Ex. The value sent by the transmitter is 5
Alarm condition 1
and relay 1 energized
• Values - Modbus code : 1438 (channel 1)
1442 (value 1 for the external transmitter)
1446 (value 2 for the external transmitter)
Ex. the value sent by the transmitter is 623
...
b4 b3 b2 b1 b0
b31
b31
...
b12 b11 b10 b9 b8 b7
b5 b4 b3 b2 b1 b0
b6
000100001100
Unit of measurement (see chart)
Nr of digits after the comma
Value sign (0=>+, 1=> -)
Ex. The formatting displayed is 268.
Unit of measurement => 12 (see chart)
Figure(s) after the comma => 1
Sign => positive
If the value measured is equal to 623 :
Résultat => 62.3 mmH O
2
Alarm 1
Alarm 2
1 m/s 12 mmH O
2
2 fpm 13 inWg
3 m3/h 14 Kpa
4 L/s 15 mmHg
5 cfm 16 mbar
6 m3/s 17 g/kg
7 °C 18 °C
8 °F 19 °F
9 %RH 20 °C (
10 PSI 21 °F
11 Pa 22 KJ/Kg
(absolute humid.
(dew temp. Td)
(dew temp. Td)
humid temp. Tw)
(humid temp. Tw)
(Enthalpy i)
ñ)
Units of measurement
CPE 300 transmitter configuration via remote control / Modbus
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