Table of Contents
Advertisement
3.5.3 Contents of the command block
The contents of the command block within the PLC are shown in the following
figures.
For a sample program that uses the dial on demand facility see section 10 at the end of
this manual.
MSB
D(x)
E
S
N
R
Y
R
R
N
S
D(x+1)
Tel. No.#1
D(x+2)
Message
#1
D(x+3)
D(x+4)
D(x+5)
D(x+6)
Where
D(x) = Head address of the Control Block as specified by the AT%ADR command.
3.5.4 Control and Status Register
The first resister of the command block read back from the PLC is dealt with on a bit
by bit basis, the break down of which is detailed below.
D(x)
Error Flag
Syntax Error b13
No Response b12
PLC comms error code b11-8
COMMAND BLOCK
PLC
N
N
Comms
A
D
Error code
N
T
Tel. No. #2
Tel. No. #3
Message
Message
#2
#3
[D]0~1999
[D]0~1999
[D]0~1999
[D]0~1999
17
LSB
N
B
T
P
S
R
Status register
C
S
C
F
T
Q
D
Y
P
Tel. No. #4 Telephone Number
register
Message
Message register
#4
Directory A Telephone
No. head address
Directory B Telephone
No. head address
Directory C Telephone
No. head address
Directory D Telephone
No. head address
b0 Dial Request
b1 Stopped Polling
b2 Polling Flag
b3 Transmission Complete
b4 Line Busy
b5 No Carrier
b6 No Dial Tone
b7 No Answer
Advertisement
Table of Contents
