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Instruction Manual 14

Set Sensor Type

This command declares the type of sensor connected to a channel. Typically, this command is exe-

cuted once for each channel during the coprocessor initialization sequence (i.e., after a hard or soft

reset). Each execution of this command specifies the sensor type for a single channel, therefore 32

invocations must occur to declare sensor types for all 32 channels.

A two-byte sequence forms the command string. The first byte contains the Set Sensor Type com-

mand opcode and target channel number. The second byte contains a Sensor Definition Code

(SDC). Each sensor type is assigned a unique 8-bit SDC. Refer to the Sensor Table at the end of

this chapter for a complete list of sensor definition codes.

Notes:

1. Undeclared channel sensor types default to the 5-Volt input range, SDC 0.

2. Declaring an invalid sensor type may result in unpredictable behavior.

3. Declaring a sensor type as “Disabled” inhibits scanning of the corresponding channel,

resulting in increased throughput for all remaining active channels.

4. Sensor data is not available immediately after declaring a channel’s sensor type; you must

wait for one complete scan loop before valid sensor data can be accessed.

COMMAND: (32 + Chan), (SensorDefinitionCode)

RESPONSE: NONE

VB Code Example:

‘**********************************************************

‘ Generic procedure used to declare any sensor type.

‘**********************************************************

Sub SetSensorType(BasePort%, Channel%, TypeCode%)

Const SET_TYPE = 32 ‘ SET SENSOR TYPE command opcode

‘ Send the command string to the coprocessor board

Call SendByte(BasePort, SET_TYPE + Channel)

Call SendByte(BasePort, TypeCode)

End Sub

‘**********************************************************

‘ Configure channel 2 for interface to K thermocouple.

‘**********************************************************

Const TYPE_K = 3 ‘ K thermocouple SDC (from Sensor Tables)

Call SetSensorType(BaseAdrs, 2, TYPE_K)

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