User Manual

Appendix A Technical Specifications
RFI-9256 Radio Modem User Manual Page 54 of 96
9 I/O control 2 9
10 Synchronisation I/O 10
11 NC
12 NC
13 GND 13
14 +12V input
15 CTS output (main port) 16
16 RTS input (main port) 15
17 DCD output (main port) 18
18 DTR input (main port) 17
19 I/O control 6 19
20 I/O control 4 20
21 I/O control 1 21
22 I/O control 3 22
23 NC
24 NC
25 GND
Table 21: RFI-9256 back-to-back repeater pin assignments
A.5 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.
A.6 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.