Cooper Instruments & Systems DFI INFINITY Digital Force Indicator/Controller - Manual (Page 53)

Each letter is represented by the two HEX-ASCII characters giving its ASCII table address, from “41” to 79” (all
upper and lower case letters) or the address, “20”, for a total of six transmitted characters (do not select
any control characters for units-of-measure).
When the desired units-of-measure to be printed have fewer than 3 characters, send the address (“20”) to
put the blank(s) in the chosen spot(s).
Note that the units-of-measure letters transmitted in the “V01” response are in plain ASCII (one character each)
in contrast with this command, where the six characters of the addresses are sent.
EXAMPLE: The computer requests the RAM setting for the measurements underway at meter #15 hex with:
“*15G1F”, and that meter, if “BUS.3=1”, responds with:
“15G1F6B5061”; the here are “6B5061”, which is HEX-ASCII for “kPa” (kilopascals).
NOTE: “00” is equivalent to “nul” and meter will transmit nothing for units of measure if the first character is “0”.
10.23 TX/RX Turnaround Delay (SERIAL DELAY)
BIT NUMBER
The four choices provided by the meter for this “20” command suffix only need two bits of storage, but the
standard byte (two nibbles) is used, so that the MSN=0.
Turn-around delay is normally used on half-duplex systems (e.g., RS-485), not on full duplex (for the meter, RS-
232 or RS-422), but the chosen amount is applied to any of these by the meter. The delay can be useful in
eliminating the effects of ringing, reflections or line drop.
Table 10.36. Serial Delay (“SER.DLY”)
MILLISECONDS OF
TURNAROUND DELAY
0 0 0
0 1 30
0 2 100
3 300 0
EXAMPLE: The computer wants meter #15 hex to use a turnaround delay of 100 milliseconds:
“*15W2002”, and if set for echo with “BUS.3=1”, the meter replies:
“15W20”. If point-to-point (only one meter), the “15” address is not used. The chosen delay is now stored
in the EEPROM. To put it into use (move to RAM), send a hard reset, “*15Z04”.
10.24 Setpoint Value (“SP1”, “SP2”, “SP3”, “SP4”)
Command suffixes “21”, “22”, “23” and “24” set the value of Setpoints 1, 2, 3 and 4 respectively (the last two
often used as Alarm 1 and 2). Each setpoint is described by three bytes (six HEX-ASCII characters), with the
sign and decimal point encoded in the MSN:
(Here, “FFFFFF” represents the 6 displayed decimal digits, the magnitude of the 20 least-significant bits of these
3 bytes.)
1. Bits 0 to 19 belong to the absolute value (99999 for the negative values and 999999 for positive values)
2. Bits 20,21, 22 belong to the decimalpoint as in Table 10.37
3. Bit 23 belongs to sign where 0 is positive and 1 is negative as in Table 10.37
CF 125 INFINITY SC GUIDE 49 M1519/N/0605