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S5-115U Manual
12.4.5 Assigning Parameters
You must define the position of the ASCII parameter set, the send and receive mailboxes and the
coordination byte in the user program in a parameter block (see Table 12-12) located in the
system data area of the CPU 943/944; you also specify the mode number there.
Table 12-12. Parameter Block for the ASCII Driver
System Data
Absolute
Word
Address
SD 48
EA60
SD 49
EA62
SD 50
EA64
SD 51
EA66
SD 52
EA68
SD 53
EA6A
SD 54
EA6C
SD 55
EA6E
Table 12-13 shows the contents of the individual bytes.
Data ID
4D
(M
)
Flag
**
H
44
(D
)
Data
**
H
*
The start addresses of the memory areas are specified here for the ASCII parameter set and the Send and Receive
mailboxes.
**
ASCII coded data ID
EWA 4NEB 811 6130-02b
High-Order Byte
ASCII parameter set
Data ID
ASCII parameter set
Data word number
SMB
Flag byte or DB number
RMB
Data ID
RMB
Data word number
CBS
Flag byte or DB number
CBR
Data ID
CBR
Data word number
Table 12-13. Parameter Block Contents
Memory Area Specification
Flag byte no.:
0 to 255
Data block no.:
2 to 255
Communications Capabilities
Low-Order Byte
ASCII parameter set
Flag byte or DB number
SMB
Data ID
SMB
Data word number
RMB
Flag byte or DB number
CBS
Data ID
CBS
Data word number
CBR
Flag byte or DB number
Mode number
*
- - -
Data word no.:
0 to 255
12-29
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