Mitsubishi QJ71C24/-R2 User Manual page 95

4 SETTINGS AND PROCEDURES PRIOR TO OPERATION
b7 b6 b5 b4 b3
4 - 14
(a) Transmission setting (CH1 side: switch 1 (lower level); CH2 side: switch 3
(lower level))
b2 b1 b0
CH1 side
CH2 side
Bit
b0
b1
b2
b3
b4
b5
b6
b7
All items listed in the table should be set to OFF for the interfaces for which
"GX Developer connection" is set in the communication protocol setting.
If connecting directly to the GX Developer, it operates with the setting value
on the GX developer. (Refer to the description below.)
1) Operation setting
• This sets whether to use each of the two Q series C24 interfaces for
independent data communication, or to use the two for linked data
communication.
• The setting and data flow for linked operation is explained in (2).
2) Data bit setting
• This sets the bit length for one character in data communicated with an
external device according to the specifications of the external device.
(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.)
• If 7 bits are set, the data is communicated by ignoring the most
significant bit (8th bit).
3) Parity bit setting
• This sets whether or not a parity bit (vertical parity) is added for one
byte of transmission/receive data, 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 Q series C24.
Description OFF (0)
Operation setting Independent
Data bit 7
Parity bit NO
Even/odd parity Odd
Stop bit 1
Sum check code NO
Write during RUN Prohibited
Setting modifications Prohibited
Transmission setting
Operation setting
Data bit
Parity bit
Even/odd parity
Stop bit
Sum check code
Write during RUN
Setting modifications
MELSEC-Q
ON (1) Remarks
Link Must be set to OFF on CH1
8 Parity bit is not included
Yes Vertical parity
Valid only when parity bit is set to
Even
Yes
2 —
Yes —
Allowed —
Allowed —
Setting description for GX Developer
Independent
8
Yes
Odd
1
Yes
Allowed
Allowed/Prohibited
4 - 14