Appendix A Technical Specifications
RFI-9256 Radio Modem User Manual
Page 64 of 109
A.6.2 Specifications
The example schematics above have the following specifications suitable for driving most relay or input
devices.
I/O (configurable)
Specification
Input
Input signal routed through (0
resistor)
Output
Open-collector Darlington output:
Integral suppression diodes
No internal pull-up
VO = 50V (max)
Sink current: 500mA (max)
Table 20: I/O Module specifications
A.7 Power Supply Notes
Power supplies used to power the RFI-9256 should have sufficient current rating and ripple rejection.
Typically <500m VRMS of power supply noise can be tolerated. The RFI-9256 contains a built in thermal
fuse that will open the circuit in the event of any over current conditions, over temperature or reverse
polarity. Power supplies used should be capable of at least 1A continuous current at 12VDC.
A.8 Version Numbering Scheme
The RFI-9256 contains a firmware version string. This version string provides some information regarding
compatibility with other firmware versions, and consists of:
Product Name:
Identifies the radio hardware type.
Major and Minor Number:
The major number generally reflects the hardware compatibility of the
firmware but may be incremented if the firmware has had a major overhaul. The minor number is
incremented as new suites of functionality have been added or when changes have been made
which render the firmware incompatible with previous versions. Combined they are the version
number.
Revision:
The revisions reflect bug fixes or minor changes that do not render the system
incompatible.
Country:
Firmware with versions with different country identifiers, are always incompatible with
their air interface. This is due to the frequencies and hopping sequences that they use. Each country
has its own spectrum allocation and laws governing radio spectrum usage.
An example version number string is shown in Figure 30.
