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21 Sensoray Model 417

Chapter 4 Programming

Read Alarms

This command (1) returns alarm status from a group of eight channels, and (2) clears the alarm sta-

tus of all channels within the 8-channel group, and (3) resets the status register ALARM bit. A

Group Code is used to designate which 8-channel block is being addressed. The first response byte

reflects the status of high limit violations and the second byte reflects the status of low limit viola-

tions. Any status bit that is set to logic 1 indicates a violated limit.

COMMAND: (108 + GroupCode)

RESPONSE: (HighLimitFlags), (LowLimitFlags)

VB Code Example:

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

‘ Fetch alarm flags from one 8-channel group.

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

Sub ReadAlarms(BasePort%, GroupCode%, HiFlags%, LoFlags%)

Call SendByte(108 + GroupCode) ‘request group alarm flags

HiFlags = ReadByte(BasePort) ‘read high flags

LoFlags = ReadByte(BasePort) ‘read low flags

End Sub

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

‘ Check alarm status. If alarm(s) are sounding, test channels 8-15 and

‘ return the number of channels sounding in AlarmCount and a list

‘ of alarming channels in AlarmList(1 to 8). Assume all other channels

‘ have disabled alarms.

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

Sub GetAlarmList(BasePort%, AlarmCount%, AlarmList%())

Dim HiFlags%, LoFlags%, Chan%

AlarmCount = 0

If (INP(BasePort + 1) And ALARM) Then

Call ReadAlarms(BasePort, 1, HiFlags, LoFlags)

For Chan = 8 to 15

If (HiFlags Or LoFlags) And (2 ^ (Chan And 7)) Then

AlarmCount = AlarmCount + 1

AlarmList(AlarmCount) = Chan

End If

Next Chan

End If

End Sub

Table 9: Channel mapping for Read Alarms command response bytes

Group

Code

Either Response Byte

D7 D6 D5 D4 D3 D2 D1 D0

Addressed

Channel

7 6 5 4 3 2 1 0

1 15 14 13 12 11 10 9 8

2 23 22 21 20 19 18 17 16

3 31 30 29 28 27 26 25 24

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 36 37

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