Cooper Instruments & Systems DFI 200 Hand Held Indicator - Manual (Page 19)

CF 112 19 Version 3.1-0
4. Invalid Command. If the command received from the host is not valid then the unit may return the following:-
<ACK>?A<CR>
Where:
<ACK> is Acknowledge (6 Dec, 06 Hex)
? is the character “?” (63 Dec, 3F Hex)
A is the responding units address
<CR> is a Carriage Return (13 Dec, 0D Hex)
If the address received from the host does not match the units address then the unit will not respond at all.
7 SPECIFICATIONS
7.1 Technical specifications
Input: Ratiometric 4 wire strain gauge.
Input Sensitivity: 80Ω to more than 2000Ω
Excitation: 5VDC
Accuracy: Up to 0.005% of full scale for alarms and display, depending on sample rate etc., see
resolution table which follows. Using and
calibration method accuracy is 1%
Sample rate: 5 to 100 sample per second, selectable.
ADC Resolution: Up to 22 bits depending on sample rate and mV/V input, see 7.4
Display update: Up to 4 per second, apparent update varies with setting
Conversion Method: Sigma delta
Microprocessor: HC68HC11F CMOS
Ambient temperature: 0 to 50o C
Humidity: 5 to 95% non condensing
Display: 4.5 digit LCD 11.7mm digit height display range -19999 to 19999
Power supply: Battery 9VDC type 216 (alkaline recommended)
Battery life: Typically 15 hours when switched on with 350 load cell connected
Low battery warning: message plus beeper
Output (standard): RS232 serial communications
7.2 Options
External memory: Memory chip, 9 pin D connector and shell
7.3 Physical characteristics
Dimensions: 80mm (w) x 145mm (l) x 39mm (d)
Connections: 9 pin “D” connector (female at instrument end)
Weight: 250gms including battery
7.4 Resolution table
Effective resolution (bits) for DFI 200 over full scale – mV / V input