Detcon 880S-N4X - Manual (Page 23)

880-N4X
880-N4X Instruction Manual Rev. 0.0 Page 19 of 36
erial Sensor Addressing (880S)
a) The 880S is set up for RS-485 communication with Serial Sensors. All sensor addresses must start at
nalog Sensor Addressing (880A)
a) The 880A is set up for RS-485 communication with Analog Sensors via the Detcon DA4 Module(s).
) Each DA4 module will accept 4 Analog Sensor inputs; labeled 1-4 on the DA4 (refer to Figure 9).
xample: If the sensor is connected to input 1 on the DA4 addressed at 01hex, it would be channel 1 on
880A Ch # DA4 # DA4 Hex Address Sensor Position
12hex
) Continue this addressing scheme until all analog sensors have been correctly identified by the 880A.
) Select “Channel Description”. The keyboard will appear, allowing the input of the Channel Tag Name, or
) Select “Gas Type”, and input the gas type of the sensor. (i.e., H2S, LEL, CO2, etc.) Up to 10 characters
0) Select “Range” and input the range of the Sensor. (i.e. 25, 50, 100, etc.) Note that the input will not allow
S
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.
A
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
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.
E
the 880A. If the sensor is connected to input 2 of the same DA4 it would be channel 2 on the 880A.
Continue this sequence for the third and fourth gas channels. Channel 5 would be connected to the second
DA4, addressed at 02hex. A matrix table for the Model DA4 modules would look like this:
1 1 01hex 1
2 1 01hex 2
3 1 01hex 3
4 1 01hex 4
5 2 02hex 1
6 2 02hex 2
7 2 02hex 3
8 2 02hex 4
9 3 03hex 1
… … … …
68 18 1
70 18 12hex 2
71 18 12hex 3
72 18 12hex 4
c
8
a brief description of the sensor, up to 20 characters maximum.
9
maximum.
1
the placement of a decimal point, therefore entries of 10 for a unit of 10ppm or 10% should be entered as
100, and likewise entries of 5 for 5ppm or 5% should be entered as 500. To correctly place the decimal
point in the entry, select the “Decimal Place” box and enter the decimal point placement. (i.e., a “Range”