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Unibrain Fire-i 501/511/601/701/702/810 Operation Manual 
 
Page 54 
 
4.8. 
Time Stamp Register 
The Time stamp register may be inquired from the fireWire bus. CYCLE_TIME register can be configured as shown in 
the table below. You may also get the same value from the user defined, but we recommend using this.   
Address 
Description( bit : msb*) 
Read/Write 
0xF0000200 CYCLE_TIME 
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
SECONDS COUNT
CYCLE COUNT
CYCLE OFFSET
Bit Numbe r
Bit Nam e
Function
DIR
Description
0 - 6
7 - 19
20 - 31
SECONDS COUNT
CYCLE COUNT
CYCLE OFFSET
Seconds Coun t
Cycle Coun t
Cycle O ffset
R/W
R/W
R/W
1 Hz c ycle timer counte r
8,000 Hz c ycle timer counte r
24.576 MHz c ycle timer counte r
Read 
 
4.9. 
Serial Interface   
Fire-i industrial cameras are equipped with SIO (Serial input/output) feature described in the IIDC 1.31 specification. 
By using the serial interface, users can execute commands by writing data in a specific address in the FireWire address 
range. SIO can be further used as a RS232 interface which supports pass through and custom commands.   
4.9.1.  SIO Pass through Scheme 
User Target System
SIO(RS232) Pass Through
Camera
FIREWIRE
Cable
RS232C
System
Controller