user manual

IRU-2xx4/3xx4 Rev. A2, 11/08
10
Automation Products Group, Inc.
APG...Providing tailored solutions for measurement applications
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SENSOR NUMBER
Up to 10 sensors may be attached to the same communication and power line.
Each sensor is then assigned a unique number. Each sensor must have a unique
Sensor Number. Sensor Numbers are assigned one at a time as the sensors are
placed on line. When assigning these values, ensure that only the desired sensor
is connected to the RS-485 line.
With only one sensor connected to the RS-485 communication lines, assign a
sensor number to a sensor by using the following steps.
1. Determine the present sensor number by reading the sensor number:
Send Receive
AAh Start Byte 66h Start Byte
01h, Sensor Number 01h Sensor Number
01h Command 01h Command
00h Data (not used) 01h Sensor # (High Byte)
00h Data (not used) 00h NA (Low Byte)
55h End Byte 00h NA
99h Stop Byte
2. Program New sensor number, Example Change from #1 to #0:
Send
AAh Start Byte
01h, Sensor Number
02h Command
00h Data
00h Data (Not Apply)
55h End Byte
BANK NUMBER
There are 10 banks (0-9) available for sensor assignment and up to 10 sensors
may be assigned to any 1 bank. However, this system will support a maximum of
10 sensors and each sensor must have a unique Sensor Number. Banks allow a
number of sensors to be controlled simultaneously.
Assign a Bank Number by,
Send
AAh Start Byte
01h, Sensor Number
03h Command
02h Data Bank number 2
00h Data (not used)
55h End Byte