Octagon 6000 Series, User Manual

Page: 63 / 233

5-14
Serial ports 6000 Series user’s manual
Remote replies: (Dear 00: FF acknowledges my new ID to be 05.)
>00XFF05A9.
; >
;message start character
; 00 ;intended listener is ID 00 (host)
; X ;command code X (reply to assign ID)
; FF ;FF = my ID
; 05 ;05 = my new ID
; A9 ;checksum = uchar (‘0’+’0’+’X’+’F’+’F’+’0’+’5’) = 0xA9
; . ;message end character
Example 3:
The following is a description of how a remote (of ID 02) can notify the
host of a state change:
1. The application program sets internal state using INT 17h function 0fh.
2. The application program sets roll call reply status to 03 (ask for Report).
3. Since a remote cannot initiate a communication, it must wait until it is
spoken to at this point.
Host sends: (Dear 02: are you there?)
>02AA5.
; >
;message start character
; 02 ;intended listener is ID 02
; A ;command code A (roll call)
; A5 ;checksum = uchar (‘0’+’2’+’A’+0x02) = 0xA5
; . ;message end character
Remote replies: (Dear 00: 02 is here. Ask for my internal state.)
>00Z02031F.
; >
;message start character
; 00 ;intended listener is ID 00 (host)
; Z ;command code Z (reply to roll call)
; 02 ;02 = my ID
; 03 ;03 = status = Ask for a report of internal state
; 1F;checksum = uchar (‘0’+’0’+’Z’+’0’+’2’+’0’+’3’) = 0x1F
; .;message end character
Host sends: (Dear 02: What is your internal state?)
>02DA8.
; >
;message start character
; 02 ;intended listener is ID 02
; D ;command code D (Internal state query)
; A8 ;checksum = uchar (‘0’+’2’+’D’+0x02) = 0xA8
; . ;message end character