Data Delivery Devices VHF, UHF & ISM Wireless RTU RFScada 8ADI-9DO 4ADI-5DO User Manual

RFScada 8ADI-9DO/4ADI-5DO Manual Ver 3.6 Copyright ©2005 Data Delivery Devices LLC Page - 51 – Bartlesville OK Tel 918-335-3318      FAX 918-398-9990 
Option Boards. 
Options are available from Data Delivery Devices LLC to add additional functionality to the 
RFScada system. These boards plug into a connector and are secured to standoffs already mounted 
on the lower half of the main board. Some option boards may be stacked for maximum flexibility. 
  

RFScada 8ADI-9DO/4ADI-5DO Manual Ver 3.6 Copyright ©2005 Data Delivery Devices LLC Page - 52 – Bartlesville OK Tel 918-335-3318      FAX 918-398-9990 
Analog Output Options, AO2, AO4 & AO8 
 
Since many applications do not require analog outputs standard RFScada units do not have 
any 4-20mA outputs installed. Options (AO2, AO4 and AO8) are available to add 2, 4 or 8 analog 
output channels which may be installed at the factory or in the field. The following chart shows the 
connections, not all of the...

RFScada 8ADI-9DO/4ADI-5DO Manual Ver 3.6 Copyright ©2005 Data Delivery Devices LLC Page - 53 – Bartlesville OK Tel 918-335-3318      FAX 918-398-9990 
 
 
 
 
 
Possibly lethal line voltages will be present on the unit’s 
circuit board when connected to AC line power. Before 
attempting to gain access, test or modify connections 
refer to a Qualified Person for assistance, instructions on 
safe operation and to ensure that connections meet all 
applicable safety procedures, standards and codes. 
 
Then...

RFScada 8ADI-9DO/4ADI-5DO Manual Ver 3.6 Copyright ©2005 Data Delivery Devices LLC Page - 54 – Bartlesville OK Tel 918-335-3318      FAX 918-398-9990 
 
4-20mA Current Loop  4-20mA Signal 
Amplifier on Output 
Option Board 
NOTE 
Try to ensure 4-20mA 
current returns via 
loop and not through 
the system ground   
This point may 
or may not be 
grounded 
depending on 
the device. 
External device with 4-
20 mA input such as 
signal amplifier, PLC, 
PC with analog input, 
display gauge etc. 
RFScada...

RFScada 8ADI-9DO/4ADI-5DO Manual Ver 3.6 Copyright ©2005 Data Delivery Devices LLC Page - 55 – Bartlesville OK Tel 918-335-3318      FAX 918-398-9990 
Generic LMR / RS-232 / RS-485 Interface Board 
 
There are some applications where the standard spread spectrum radios installed on 
RFScada devices are not authorized for operation, or they are not the most suitable radios for 
particular distances and terrains. Instead of the standard factory installed spread spectrum radio a 
RadInt Land Mobile Radio...

RFScada 8ADI-9DO/4ADI-5DO Manual Ver 3.6 Copyright ©2005 Data Delivery Devices LLC Page - 56 – Bartlesville OK Tel 918-335-3318      FAX 918-398-9990  

RFScada 8ADI-9DO/4ADI-5DO Manual Ver 3.6 Copyright ©2005 Data Delivery Devices LLC Page - 57 – Bartlesville OK Tel 918-335-3318      FAX 918-398-9990 
Spectrum Analyzer Mode and Network Integrity. 
 
  The RFScada units have extensive checksum and error detection for all exchanged data; any 
corrupted data is completely ignored by the system. If corrupted data continues to arrive without a 
good data packet for longer than the programmed ‘timeout’ value units will revert to a default state 
(unless the...

RFScada 8ADI-9DO/4ADI-5DO Manual Ver 3.6 Copyright ©2005 Data Delivery Devices LLC Page - 58 – Bartlesville OK Tel 918-335-3318      FAX 918-398-9990 
counts’ button. This is useful if a change has been made and the effects may be quickly observed. 
Note that larger samples give more accurate results. Moving the mouse pointer over each column will 
display the unit number and signal integrity as a percentage. In the example shown above there are 
31 slave units in the network, and all but two have good...

RFScada 8ADI-9DO/4ADI-5DO Manual Ver 3.6 Copyright ©2005 Data Delivery Devices LLC Page - 59 – Bartlesville OK Tel 918-335-3318      FAX 918-398-9990 
setting is 10 seconds). As may be seen from the graphs, the timeout setting has a great influence on 
the packet integrity required to maintain reliable operation.  
 
Average Time between a Single Network Error vs Packet Integrity (1 Year Scale)
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.91
0 15 30 45 60 75 90 105 120 135 150 165 180 195 210 225 240 255 270 285...

RFScada 8ADI-9DO/4ADI-5DO Manual Ver 3.6 Copyright ©2005 Data Delivery Devices LLC Page - 60 – Bartlesville OK Tel 918-335-3318      FAX 918-398-9990 
of 10 seconds allows ample tolerance for reliable communications; even with a signal integrity value 
of 37% an error would only be expected once every 68 years. Extending the timeout to 20 seconds 
lowers the signal integrity required to approximately 20% for a similar time between errors. The 
timeout will probably never need to be changed unless the...