Calex PyroMini Serie Guía Del Operario página 16

WIRING (ALL MODELS)
Check the distance between the sensing head and the electronics module, and between the
electronics module and the instrumentation. If necessary, the sensor can be ordered with a longer
cable between the sensing head and the electronics module.
Do not extend or shorten the sensing head cable. The head and electronics module are
calibrated as a pair, and modifying the sensing head cable can affect the measurement
accuracy. Contact Calex for assistance.
The output cable from the electronics module should have an outer diameter between 3.0 and 6.5
mm, with conductors of size 28 to 18 AWG.
The terminal blocks in the electronics module may be removed from the circuit board for easy wiring.
Do not disconnect the touch screen circuit board from the main circuit board while the sensor is on.
WIRING (-BB AND -BRT MODELS)
When connecting several sensors in a single Modbus network, all of the sensors should be
connected via a junction box to a single network bus cable, running from the furthest sensor to the
Modbus Master.
Up to 247 sensors may be connected to a single Modbus network. Each sensor must have a
unique Modbus address. The Modbus address may be changed via the touch screen interface on
-BRT models, or via Modbus.
To help prevent data reflections, please ensure the cable between each sensor and the main
network bus is as short as possible. The network bus should be terminated with a resistor of 120Ω
between the RS+ and RS- wires. The PWR- wire of the bus should be connected to the signal
ground of the Modbus Master.
MODBUS OVER SERIAL LINE (RS485)
Interface
Baud rate
Format
Reply delay (ms)
Supported functions
Read register
Write single register
Write multiple register
Mask write register
Read/write
The list below includes all available addresses:
R = Read
W = Write (single, multiple or read/write)
MW = Mask write
Address Length
(words)
0x00 1
0x02 2
›
1 6
9600
8 data, No parity, 1 stop bit
20
0x03, 0x04
0x06
0x10
0x16
0x17
Description
MODBUS slave address
Sensor identification register
Bits 0..19 - Serial number
Bits 20..23 - Sensor type (12 = PyroMini)
Bits 24..26 - Sensor field-of-view
For MA : 0 = 2:1, 1 = 15:1, 2 = 30:1
For HA : 0 = 20:1
Bits 28..32 - Reserved
R/W/MW
R/W*
R