Campbell-scientific SDM-IO16 16-Channel Input/Output Expansion Module Manuale Utente Scaricare il pdf (Pagina 33)

SDM-IO16 16 Channel Input/Output Expansion Module

; Call instruction 188 to set the ports up

2: SDM-IO16 (P188)

1: 00 SDM Address

2: 90 Command Code Option

3: 4444 Ports 16-13 ;configure the ports

4: 4444 Ports 12-9 ;Set so all ports will cause an interrupt

5: 4444 Ports 8-5

6: 4444 Ports 4-1

7: 1 Return Code Loc [ Errcount ] ;for return code

8: 2 First Loc [ Portstat_]

9: 1.0 Mult

10: 0.0 Offset

;Set flag 1 high to indicate we have run the setup code

3: Do (P86)

1: 11 Set Flag 1 High

4: End (P95) ; of IF block

;Now the rest of the other normal measurements would follow

*Table 2 Program

02: 0.0000 Execution Interval (seconds)

*Table 3 Subroutines

;Subroutine 98 will be run when a signal is generated by the I/O line

;from the IO16 connected to C8 on the datalogger.

1: Beginning of Subroutine (P85)

1: 98 Subroutine 98

;First read the port status from the IO16 as quickly as possible

;The speed at which the datalogger can respond to the I/O signal will

;determine the minimum pulse width that you can guarantee to capture

;as a change of state of a port. Typically this will be 10 ms but will

;vary with the datalogger and other activity.

;Reading the port status will cancel further polling

;until the next change of state.

2: SDM-IO16 (P188)

1: 00 SDM Address

2: 91 Command Code Option ;read the port status into one location

3: 0 Ports 16-13 ;port settings not used for code 91

4: 0 Ports 12-9

5: 0 Ports 8-5

6: 0 Ports 4-1

7: 1 Return Code Loc [Errcount ] ;for return code

8: 2 First Loc [Portstat ]

9: 1.0 Mult

10: 0.0 Offset

1 2 ... 28 29 30 31 32 33 34 35 36 37 38 ... 43 44

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Campbell-scientific SDM-IO16 16-Channel Input/Output Expansion Module Manuale Utente Pagina 33

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