I received the message below last night from someone named John. I believe it is a legitimate messages asking for help on Modbus. However, it appears to come from a blacklisted e-mail address at Argonne, so I cannot reply directly.
I am hoping that the sender reads tech-talk, so here is the reply. Please either use tech-talk to reply or send a message from another e-mail address.
Your record has probably not yet been processed, since SEVR=INVALID and STAT=UDF. Please send your sim1.cmd (renamed to .txt so it gets though the mailer) and the database you used.
Mark
***********************************************************************************************
Hi Mark,
I am trying to test the modbus module on EPICS, I am using the sim1.cmd to connect with a modbus slave simulator. It looks connection is OK, there is no any warning message in IOC site. But when I modified the coil value in simulator slave
, I use the dbpr command to verify it , I can't find any change:
dbpr SIM1:BO0B
ASG: DESC: DISA: 0 DISP: 0
DISV: 1 NAME: SIM1:BO0B RBV: 0 RVAL: 0
SEVR: INVALID STAT: UDF TPRO: 0
VAL: 0
I config the modbus slave simulator is :
address : 0001
length : 128
modbus point type : 01:coil status
I think it should be right because I use modbus server to verified it. The simulator server always can read the simulator slave variables correctly.
Did I miss something?
Thanks
John