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Data message format
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Table 5-4 Serial port data transfer object instance attributes
Attribute ID Name Data type Data value Access
rule
1 Transmit (PLC to GW EIP/ASCII...) message data
Structure of:
Produced data
sequence number
UINT 0-65535 (FFFF
hex
) Set/Get
Data length UINT 1-440
Data array Array of USINT 0-255
2 Receive (GW EIP/ASCII... to PLC) message data
Structure of:
Produced data
sequence number
UINT 0-65535 (FFFF
hex
) Get
Data length UINT 1-440
1
Data array Array of USINT 0-255
3 Receive (GW EIP/ASCII... to PLC) produced data sequence number
Normally sent to the
PLC from the
GW EIP/ASCII... in
data transfer
UINT 0-65535 (FFFF
hex
) Set/Get
5 Transmit (PLC to GW EIP/ASCII...) produced data sequence number
Normally sent to the
GW EIP/ASCII...
from the PLC in data
UINT 0-65535 (FFFF
hex
) Set/Get
1
For polling transfer to PLC mode only
The maximum sized serial port message in the “Write-to-Tag” field when set to Transfer
to PLC is 1518 bytes.
Table 5-5 Serial port data transfer object common services
Service code Implemented in
class
Implemented in
instance
Service name
0E
hex
Yes Yes Get_Attribute_Single
10
hex
No Yes Set_Attribute_Single