Det-Tronics OPECL Infrared Hydrocarbon Gas Detector User Manual
Page 45
H-3
95-8556
10.1
sEtting nEtwork addrEssEs
overview of network addresses
Each OPECL receiver on the EQP LON must be assigned a unique address. (Since transmitters do not reside on
the LON, no network address switch setting is needed.)
Addresses 1 to 4 are reserved for the EQP controller. Valid addresses for field devices including OPECL gas
detectors are from 5 to 250.
Important
If the address is set to zero or an address above 250, the system will ignore the switch setting and the
device.
The LON address is programmed by setting rocker switches on an 8 switch “DIP Switch” located within the
OPECL housing. The address number is binary encoded with each switch having a specific binary value with
switch 1 being the LSB (Least Significant Bit). (See Figure H-1.) The device’s LON address is equal to the added
value of all closed rocker switches. All “Open” switches are ignored.
Example
: for node No. 5, close rocker switches 1 and 3 (binary values 1 + 4); for node No. 25, close rocker
switches 1, 4 and 5 (binary values 1 + 8 + 16).
NOTE
For convenience in setting LON address switches, a “Rocker Switch Table” is included in the EQP System
manual (form 95-8533).
1 2 3 4 5 6 7 8
1 2 4 8 16 32 64 128
ON
NODE ADDRESS EQUALS THE ADDED VALUE
OF ALL CLOSED ROCKER SWITCHES
A2190
BINARY
VALUE
CLOSED = ON
OPEN = OFF
Figure H-1—OPECL Address Switches