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16
External Control Lines
EXTERNAL CONTROL LINES
16.1 TARE (PIN 1)
16.2 PEAK (PIN 2)
16.3 VALLEY (PIN 3)
16.4 SWLIN2 (PIN 4)
16.5 PEAK & VALLEY OR EXTERNAL RESET (PIN 5)
16-1
P2, the 20-pin connector at the rear of the main board, connects to the
setpoint transistor collectors and permits remote control of significant meter
features.
The meter case label gives the names (abbreviated functions) of each of the
twenty pins of P2, the center-bottom connector. Refer to Figure 16-1.
PEAK/VALLEY OR EXT. RESET
DISPLAY HOLD
RESET ALARMS AND/OR
PRINT COMMAND
NONSTANDARD TX
Figure 16-1. Connector Label Detail
Tare is available when P2-1 and P2-4 are connected to a momentary contact
switch. This feature allows you to automatically zero your meter when the
switch is activated.
When this is connected to P2-4 by an external switch, the meter displays the
stored PEAK ("HI RDG") value rather than the current reading. The display
flashes to distinguish this value.
When this is connected to P2-4 by an external switch, the meter displays the
stored valley ("LO RDG") value rather than the current reading. The display
flashes to distinguish this value.
Completes the circuit for any of the above three signals.
Connecting this to ground (P2-7) when "RDG.7=0" has been programmed
causes a "HARD" RESET (when you see "RESET2" on the display). If you
set "RDG.7=1", grounding causes only a PEAK/VALLEY RESET.
P2
1
2
TARE(T)
3
4
VALLEY (V)
5
6
7
8
DIG RTN
9
}
10
}
11
12
13
14
15
16
+V EXT
17
18
SP2
19
20
AL2
PEAK (P)
SWLIN2
PUSH TO CAL
+5V
LOCKOUT EEPROM &
MENU PUSH BUTTON
NONSTANDARD RX
PUSH TO CAL
SP1
AL1
RTN EXT
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