Cooper Instruments & Systems DFI INFINITY Digital Force Indicator/Controller - Manual (Page 35)

1. For Process, Strain Gauge, Temperature and Universal meters:
a) Slow mode = 0 to 300 ms
b) Fast mode = 0 to 100 ms
2. For Ratemeter/totalizer, Batch meter with chunk transmissions:
a) Rate mode = 0 to 35 ms
b) Batch mode = 0 to20 ms
c) Square-root mode = 0 to 40 ms
3. For Ratemeter/totalizer, Batch meter with single long transmission:
a) Rate mode = 0 to 80 ms
b) Batch mode = 0 to 50 ms
c) Square-root mode = 0 to 85 ms
NOTE: Although single long transmission’s delay seems longer than chunk transmission, in most cases total
transmission time will be shorter, especially using 19200 baud rate.
9.2
Point-To-Point Continuous Mode
As described before, the meter transmits its different measurement values in strings of characters continuously
on the bus. The length of the string is variable and is controlled by two menu items: “DAT FT” and “BUS FT”
(see Sections 10.18 and 10.19). The time between consecutive transmission is also controlled by another menu
item: “SERCNT” (for temperature, process, strain, universal meters or “SER TI” (for rate/totalizer, batch meters).
This item is in units of “numbers of readings” for temperature, process, strain, universal (Section 10.20) and
“Time in seconds” for ratemeter/totalizer, batch (Section 11.27).
9.2.1 Meter’s Response Time
For Process, Strain Gauge, Temperature and Universal meters, this is the difference in time from the moment
when the Serial Count (“SERCNT”) value is reached to the time of transmission of the first character of the data
string. For rate/totalizer, batch meters, this the difference in time from the moment when the Serial Time (“SER
TI”) value is reached to the time of transmission of the first character of the data string.
METER RESPONSE TIME:
1. For Process, Strain Gauge, Temperature and Universal meters:
a) Slow mode = 0 to 300 ms
b) Fast mode = 0 to 100 ms
2. For Ratemeter/totalizer, Batch meter with chunk transmission:
a) Rate mode = 0 to 35 ms
b) Batch mode = 0 to 20 ms
c) Square-root mode = 0 to 40 ms
3. For Ratemeter/totalizer, Batch meter with one time transmission:
a) Rate mode = 0 to 80 ms
b) Batch mode = 0 to 50 ms
c) Square-root mode = 0 to 85 ms
NOTE: Although transmission’s program delay seems longer than chunk transmission, in most cases total
transmission time will be shorter, especially using 19200 baud rate.
9.2.2 Communicating With The Meter When In Continuous Mode
If the meter is in point-to-point continuous mode, it ignores any transmitting command. On the other hand,
transmitting “X-OFF” character (13 Hex), which is equivalent to the “RTS line false”, will halt continuous
transmission. Transmitting “X-ON” character (11 hex) or making “RTS line true” will resume continuous
CF 125 INFINITY SC GUIDE 31 M1519/N/0605