Cooper Instruments & Systems DFI INFINITY B Ultra High Performance Digital Force Indicator - Manual (Page 76)

31.8 +5 V (PIN 8)
Up to 20 mA is available for driving external devices, but isolation should be provided if there is a possibility of common
mode (ground) currents, since this supply is NOT isolated from the signal input.
31.9 DISPLAY HOLD (PIN 9)
Grounding this pin to P2-7 freezes the display value. However, the meter continues to take new samples and update the
other outputs, such as Analog Output, Setpoints/Alarms, and Peak/Valley.
31.10 LOCKOUT EEPROM (AND ‘MENU’ BUTTON) (PIN 10)
Grounding this pin to P2-7 stops any configuration changes and new storage into the non-volatile memory, and when in
run mode does not allow entry into the setup mode when the ‘MENU’ button is pressed. This function is available if unit is
set for “Menu 2” mode. If “Menu 1” mode is selected, use Lockout via ID codes, see Section 29 (Lockout Configuration).
For more details on Menu Modes see Section 1.4 (Modes of Operation) and Section 4.1 (Parts of the Meter, Menu
Button Function in Configuration Mode).
31.11 RESET OF ALARMS (PIN 11)
Grounding this pin to P2-7 causes the alarm latches to reset.
31.12 NONSTANDARD RX (PIN 12) AND NONSTANDARD TX (PIN 13)
These two pins allow digital communications with the meter using 5 V CMOS logic levels and RS-232 protocols and
format. This access is normally reserved for specialized equipment communication in a calibration lab or at the factory.
31.13 NO CONNECTION (PIN 14)
31.14 +V EXT (PIN 15)
This is the pin on which to bring in isolated external 5 to 30 V to power the snubbing diodes of the four setpoint/alarm
open-collector transistors.
31.15 SP1 (PIN 16)
The open-collector of the first setpoint transistor (can carry 150 mA).
31.16 SP2 (PIN 17)
The open-collector of the second setpoint transistor (can carry 150 mA).
31.17 AL1 (PIN 18)
The open-collector of the third setpoint (first alarm) transistor (can carry 150 mA).
31.18 AL2 (PIN 19)
The open-collector of the fourth setpoint (second alarm) transistor (can carry 150 mA).
31.19 RTN EXT (PIN 20)
This is the return to the external ground (P2-20) of the external power for the setpoint transistors and snubbing diodes
brought in on P2-15, 16, 17, 18 and 19. Figure 30-2 shows an example of a circuit using an external relay with SP1
(Setpoint 1). If a solid state relay is used, delete connection to Pin 15.
CF 156 71 M2544/N/0505