Detcon 880S-N4X - Manual (Page 25)

880-N4X
880-N4X Instruction Manual Rev. 1.0 Page 21 of 40
7) Each channel must be set up with the correct parameters for each sensor. Use the wand to select a channel
from the “Main Screen”, this will open that channels corresponding “Channel X Details Screen” (Figure
34).
Figure 34 Channel Detail Screen
8) The Model 880 is set up for RS-485 Modbus™ communication. All communications with the sensors are
accomplished through the RS-485 communications Protocols. The set up for Serial Sensors (Model 880S)
is different from the set up for Analog Sensors (Model 880A) using the DA4 Modules:
Serial Sensor Addressing (880S)
a) The 880S is set up for RS-485 communication with Serial Sensors. All sensor addresses must start at
01hex and increment sequentially. Serial Sensors should be addressed (in hex) to match the channel
number (in decimal) that they are assigned to. I.E., channel number 1 should be addressed as 01hex,
and likewise channel number 10 should be addressed as 0Ahex. Failure to do so will cause a
communication fault to occur, and the fault will not clear until the addresses are set properly for all
sensors attached to the unit. Refer to Appendix B for Hexadecimal to Decimal conversion table.
Analog Sensor Addressing (880A)
a) The 880A is set up for RS-485 communication with Analog Sensors via the Detcon DA4 Module(s).
The DA4 Module addresses must start at 01hex and increment sequentially. I.E., the first DA4 should
have address 01hex, the second 02hex, etc., continuing sequentially until the last DA4. The maximum
number of DA4’s that can be connected to the unit is 18, or 12hex.
b) Each DA4 module will accept 4 Analog Sensor inputs; labeled 1-4 on the DA4 (refer to Figure 10).
The physical channel number of a sensor corresponds to the DA4 it is connected to, as well as the
sensor input on the corresponding DA4.
Example: If the sensor is connected to input 1 on the DA4 addressed at 01hex, it would be channel 1 on
the 880A. If the sensor is connected to input 2 of the same DA4 it would be channel 2 on the 880A.