Re:Re: Question about a tutorial wiritten by Norum

[marco_hair <marco_hair@163.com>]

 hi, Eric:

 

I follow your tutorial, but seems there is sth. wrong in my test code.

this is dbtr message:

 

epics> dbtr AB300:FilterWheel:fbk
ACKS: NO_ALARM      ACKT: YES           ADEL: 0             ALST: 0            
ASG:                BKPT: 0x00          DESC: Filter Wheel Position            
DISA: 0             DISP: 0             DISS: NO_ALARM      DISV: 1            
DTYP: AB300         EGU:                EVNT: 0             FLNK:CONSTANT 0    
HHSV: NO_ALARM      HIGH: 0             HIHI: 0             HOPR: 0            
HSV: NO_ALARM       HYST: 0             INP:GPIB_IO #L0 A0 @2                  
LALM: 0             LCNT: 0             LLSV: NO_ALARM      LOLO: 0            
LOPR: 0             LOW: 0              LSV: NO_ALARM       MDEL: 0            
MLST: 0             NAME: AB300:FilterWheel:fbk             NSEV: NO_ALARM     
NSTA: NO_ALARM      PACT: 1             PHAS: 0             PINI: NO           
PRIO: LOW           PROC: 0             PUTF: 0             RPRO: 0            
SCAN: Passive       SDIS:CONSTANT       SEVR: INVALID       SIML:CONSTANT      
SIMM: NO            SIMS: NO_ALARM      SIOL:CONSTANT       STAT: UDF          
SVAL: 0             TPRO: 0             TSE: 0              TSEL:CONSTANT      
UDF: 1              VAL: 0             
epics> 2008/10/01 00:11:33.540 192.168.1.103:4001 write 2
Â\201

epics> 2008/10/01 00:11:35.468 192.168.1.103:4001 read 4
U\020\000\020
2008/10/01 00:11:37.465 AB300:FilterWheel:fbk convert failed Invalid reply

 

I change the code in devAB300.c like this: 

  {&DSET_LI, GPIBREAD, IB_Q_LOW, "\252\201\000\201", NULL, 0, 10,                                                      
   convertCurrentReply, 0, 0, NULL, NULL, NULL},                                                                       
 

why can I only send 2 bytes to device through an Ethernet/serial box?

How to change the Oct format to Hex/Dec in st.cmd?

 

Thanks a lot again. 

 

å2008-09-30ï"Eric Norum" <norume@aps.anl.gov> åéï
>On Sep 30, 2008, at 7:58 AM, Silver wrote:
>
>> hi, all:
>>
>>  I want to write a driver for one of our serial devices, so I read  
>> "How to create EPICS device support for a simple serial or GPIB  
>> device". (http://www.aps.anl.gov/epics/modules/soft/asyn/R4-9/HowToDoSerial/tutorial.html 
>> )
>>
>> While I have several questions:
>>  1. in the tutorial, it said:
>>
>> Command array index 0 â Device Reset
>> {&DSET_LO, GPIBWRITE, IB_Q_LOW, NULL, "\377\377\033", 10, 10,
>>       NULL, 0, 0, NULL, NULL, "\033"},
>> I don't understand what's the meaning of "\377\377\033", does it  
>> mean "377" is oct number?
>
>Yes.  That's standard C syntax.
>If you prefer hexadecimal the equivalent would be "\xFF\xFF\x1B".
>
>>
>>
>>  2. in function "convertPositionReply" and "convertStatusReply",
>> first time, pli->val = pdpvt->msg[0];
>> second time, pli->val = pdpvt->msg[1];
>> Does it mean the AB300's response data begin from different  
>> position? can anyone give me some explanation?
>
>The AB300 response always contains both position information (in the  
>first character) and status information (in the second character).
>
>>
>> I have never used GPIB device before, so forgive my innocence.
>> Thanks a lot in advance.
>
>If your device is IEEE-488.2 compliant the makeSupport .pl command in  
>the ASYN distribution will set up a number of command table entries  
>that you could study.  The command usage is:
>/bin//makeSupport.pl -t  
>devGpib 
>
>-- 
>Eric Norum 

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