Measurement-computing WLS-TC Bedienungsanleitung PDF herunterladen (Seite 20)

WLS-TC User's Guide Specifications

Digital input/output

Table 5. Digital input/output specifications

Parameter

Specification

Digital type

CMOS

Number of I/O

8 (DIO0 through DIO7)

Configuration

Independently configured for input or output.

Power on reset is input mode unless bit is configured for alarm.

Pull up/pull-down

configuration

All pins pulled up to +5 V via 47 K kΩ resistors (default). Pull down to ground (GND)

also available.

Digital I/O transfer rate

(software paced)

 Digital input – 50 port reads or single bit reads per second typ

 Digital output – 100 port writes or single bit writes per second typ

Input high voltage

2.0 V min, 5.5 V absolute max

Input low voltage

0.8 V max, –0.5 V absolute min

Output low voltage

(IOL = 2.5 mA)

0.7 V max

Output high voltage

(IOH = –2.5 mA)

3.8 V min

Note 7: All ground pins on the device (pins 9, 19, 28, 38) are isolated from earth ground. If a connection is

made to earth ground when using digital I/O and conductive thermocouples, the thermocouples are no

longer isolated. In this case, thermocouples must not be connected to any conductive surfaces that may

be referenced to earth ground.

Temperature alarms

Table 6. Temperature alarm specifications

Parameter

Specification

Number of alarms

8 (one per digital I/O line)

Alarm functionality

Each alarm controls its associated digital I/O line as an alarm output. The input to each

alarm may be any of the analog temperature input channels. When an alarm is enabled, its

associated I/O line is set to output (after the device is reset) and driven to the appropriate

state determined by the alarm options and input temperature. The alarm configurations are

stored in non-volatile memory and are loaded at power on. Alarms will function both in

wireless mode and while attached to USB.

Alarm input modes

 Alarm when input temperature > T1

 Alarm when input temperature > T1, reset alarm when input temperature goes below T2

 Alarm when input temperature < T1

 Alarm when input temperature < T1, reset alarm when input temperature goes above T2

 Alarm when input temperature is < T1 or > T2

Note: T1 and T2 may be independently set for each alarm.

Alarm output modes

 Disabled, digital I/O line may be used for normal operation

 Enabled, active high output (digital I/O line goes high when alarm conditions met)

 Enabled, active low output (digital I/O line goes low when alarm conditions met)

Alarm update rate

1 second

Memory

Table 7. Memory specifications

Parameter

Specification

EEPROM

1,024 bytes isolated micro reserved for sensor configuration

256 bytes USB micro for external application use

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 26

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