Cooper Instruments & Systems DFI INFINITY Digital Force Indicator/Controller - Manual (Page 52)

Table 10.35. Bus Format (“BUS FT”), Bits 7 and 6
BIT NUMBER
7 6 FUNCTION
x 0 RS-485 board not installed
x 1 RS-485 board installed
0 x External print command on P2-11 disabled*
1 x External print command on P2-11 enabled*
*P2-11 is shared with alarm reset command (Refer to Section 10.10, Table 10.22)
The least-significant nibble of “BUS FT” should have the two least-significant bits set to zero (reserved for future
checksum/line feed features). The other two bits select point-to-point/multipoint operation (RS-232 point-to-
point, RS-485 either one), and meter silence or echo of commands.
EXAMPLE: The computer inquires as to the program stored in the EEPROM of meter #15 hex with:
“*15R1C”, and the meter replies:
“15R1C5C”, which states that it is set for multipoint command mode with echo (since this command was
echoed, you could tell that it was in the echo mode; since multipoint is always in the command mode, that status
was known as well).
10.20 Number Of Readings Between Each Transmission (“SER CNT”)
The “1D” command suffix data is the number of readings between transmissions; this is used only for point-to-
point continuous transmission. Four nibbles (2 bytes or 4 HEX-ASCII characters) are used; overflow detection
limits the number of readings between transmissions to 59999 (decimal).
“1D” values reside only in EEPROM, so only “R/W” command letters apply.
EXAMPLE: If you were on SLOW (approximately 3 readings/second) and wanted a transmission every hour,
the number of readings between transmissions would be approximately 3*60*60=10800, or hex 2A30: to tell the
meter, send:
“*W1D2A30”, which places the 2A30 into the EEPROM memory of the meter (add a Hard Reset,
“*Z04” to move this into RAM). If you have set “BUS.3=1”, the meter will echo “W1D”.
10.21 Recognition Character
You can change the security code for commands with this “1E” command suffix; the ASCII table address (two
HEX-ASCII characters) of the selected character is transmitted.
Valid character addresses are from 20 hex to 7F hex (32 to 127 decimal) with the exception of “^”, “A”, “E”
characters.
EXAMPLE: To change the recognition character from “*” to “!” for all meters on the bus, send:
“*00W1E21”, which puts that new code into EEPROM (but not automatically into RAM), followed by
“*00Z04”, which gives a hard reset t all the meters, moving the new code into RAM. All meters will now
ignore commands preceded by “*”, and recognize those preceded with “!”.
10.22 Units Of Measure
When instructed with this “1F” command suffix, the meter will label its transmitted values with three letters
representing the units of the measured quantity (these are for screen or printer labels, not for the meter display;
the right-hand digit F, C or K units for temperature are selected by “RDG.CNF”, Section 10.3).
CF 125 INFINITY SC GUIDE 48 M1519/N/0605