Mitsubishi MELSEC LJ71C24, User Manual

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7 SETTINGS FOR THE C24
7.3.1 Transmission Setting
Set the transmission specification with external devices.
(1) Operation setting
The following two types of operations can be set.
(a) Independent operation
Two interfaces of the C24 perform data communication with external devices
independently.
(b) Linked operation
All data received from one of the two interfaces are transmitted from the
other interface.
For the settings of linked operation and data flow, refer to Section 7.3.5.
(2) Data bit
This sets the bit length for one character in data communicated with an external
device according to the specifications of the external device.
If "7" is set, the data are communicated by ignoring the most significant bit (8th
bit).
When data communication is performed using Format 5 of the MC protocol (for
binary code communication), it is necessary to set it to 8 bits when processing
the sum check code with the bidirectional protocol.
(3) Parity bit
This sets whether the parity bit (vertical parity) should be odd parity or even parity
when adding the parity bit (vertical parity), according to the specifications of the
external device.
The addition of the parity bit to the transmission data and the checking of the
parity bit of receive data are performed by the C24.
(4) Even/odd parity
This sets whether the parity bit (vertical parity) should be odd parity or even parity
when adding the parity bit (vertical parity), according to the specifications of the
external device.
(5) Stop bit
This sets the stop bit length for one character in data communicated with an
external device, according to the specifications of the external device.
(6) Sum check code
This sets whether or not a sum check code is added to transmission and
reception messages of each frame and format during data communication using
the MC or bidirectional protocol, according to the specifications of the external
device.
For an explanation of the message configuration and sum check code when a
sum check code is added, refer to the applicable explanation of each protocol.