RFID Logic Help

[pcmccartney1 141]

S7-315F 2DP with an ET200pro hosting a RF170C with read/write heads with Moby-D tags MDS D424. Downloaded a read most every manual. Still not sure how to code a triggered read or write to a specific head. I believe I need to parameterize DB45 (Parameters) and DB47 (Commands) and view data in DB48. But unsure how to setup a steping drum sequencer that would monitor when the ASM is available or ready for the next command, when it's busy, that it is processing the command or that it has finished the command. Seimens talks about monitoring the status word, I have no idea where to find this. Also told that I expected to compare two counters (command counter and acknowledgement counter) to verify they are equal. Looking at DB45 I see a counter named counter_customer but no other references. Looking for some example code to trigger reads and wirtes to both heads. Any help would be appreciated. Rick