App - 34 App - 34
MELSEC-Q
APPENDIX
Appendix 7.2.5 How to connect the communication module to an external device and
precautions on specifying control by signals
In the following, some precautions on specifying the control by signals using an
interface connection between the communication module and an external device are
given using the RS-232C interface as an example.
(1) When only the RS (RTS) and CS (CTS) control signal lines are
looped back on the communication module side
Communication
module
(Signal name)
RD(RXD)
SD(TXD)
ER(DTR)
SG
DR(DSR)
RS(RTS)
CS(CTS)
Connector
RS-232C
External
device
Connector
If the RS (RTS) control is disabled, data can be received from the external device
but data cannot be sent to the external device.
In order to send data, turn the RS (RTS) control signal ON using processing code
32 of the ZCNTL instruction.
(2) When only the ER (DTR) and DR (DSR) control signal lines are
looped back on the communication module side
Communication
module
(Signal name)
RD(RXD)
SD(TXD)
ER(DTR)
SG
DR(DSR)
RS(RTS)
CS(CTS)
Connector
RS-232C
External
device
Connector
If the ER (DTR) control is disabled and DR (DSR) control is enabled, data can be
received from the external device but data cannot be sent to the external device.
In order to send data, disable the DR (DSR) control.
Содержание A1SD51S
Страница 183: ...11 13 11 13 MELSEC Q 11 INSTRUCTIONS AND FUNCTIONS RUN Before swap A 0 H924 A 1 H1159 After swap A 0 H1159 A 1 H924 OK...
Страница 331: ...11 161 11 161 MELSEC Q 11 INSTRUCTIONS AND FUNCTIONS REMARK See the CON ON OFF STOP and ZOPEN functions and Section 7 4...
Страница 557: ...11 387 11 387 MELSEC Q 11 INSTRUCTIONS AND FUNCTIONS REMARK See the CHR SPACE and SPC functions...
Страница 629: ...11 459 11 459 MELSEC Q 11 INSTRUCTIONS AND FUNCTIONS REMARK See the ZOPEN ZSEND and ZCNTL instructions and Section 7 3 4...
Страница 645: ...11 475 11 475 MELSEC Q 11 INSTRUCTIONS AND FUNCTIONS REMARK See the ZEVENT ZSIGNAL and DEF ZEVENT instructions...