Cooper Instruments & Systems DFI INFINITY Digital Force Indicator/Controller - Manual (Page 34)

10. Read block of data from EEPROM in point-to-point mode when the meter is operating in Batch Mode:
Command format *R42
Response format R4244114
where 44 HEX is the TOTAL value, 11 HEX is the Batch count, and 4 HEX is the BAT NO.
9. METER BUS RESPONSE
As detailed before, the meter can receive and transmit at baud rates up to 19,200. No data is ever lost by the
meter even at the highest rate with the most complex meter program, provided that the computer does not
attempt to interrupt a transmission from the meter by transmitting at the same time.
When not transmitting, the meter continually looks for a new character on the bus. When any character is
received, the meter drops out of ALARM mode; (if in that mode) checks for the Recognition Character, the start
of a new message.
Remember that the menu item “BUS FT” sets different modes of communications as:
1. BUS .3 = 0: No echo mode
= 1: echo mode
2. BUS .4 = 0: Point-to-point
= 1: Multipoint
3. BUS .5 = 0: Point-to-Point continuous mode
= 1: Point-to-Point command mode
4. BUS .6 = 0: Message handshake when continuous mode
= 1: Character handshake when continuous mode
9.1 Point-To-Point or Multipoint Command Mode
If the recognition character is correct, the meter now checks for the address in the Multipoint mode.
When a match is obtained, the meter then decodes the Command Code and fulfills that command. Otherwise,
the meter ignores the command and continues to look for another recognition character.
9.1.1 Meter’s Response Time
RESPONSE TIME: this is the period from the time the meter detects the first command character to the time
that it starts transmitting proper response.
Response time=Transmit command time + program delay time + turn around delay time.
Where:
Transmit Command Time = the transmission period of full command from the host computer to the meter.
[(# of bits in a character) * (# of characters)]-[baud rate] (in seconds) where: * = Multiply.
# of bits in a character = 10 or 11 (see Sections 4.12 and 6);
Turn around delay = Receive to transmit delay and can be programmable to 0, 30, 100, 300 ms (200 ms for
ratemeter totalizer). For the following data turn around delay assumed 0.
METER RESPONSE TIME:
CF 125 INFINITY SC GUIDE 30 M1519/N/0605