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MELSEC-Q
3 SPECIFICATIONS
The following table shows the suitable connector shell for the RS-232 connector.
Type Model
Connector shell
17JE-23090-02(D8A)(-CG)
1
1 Manufactured by DDK Ltd.
(4) Tightening torque
For details on the tightening torque for the RS-232 interface connector, refer to
Section 4.1.
REMARKS
(1) Confirmation of RS-232 control signal status
Each status of the control signals, ER(DTR), DR(DSR), RS(RTS) and
CD(DCD) can be confirmed in RS-232 control signal status (address:
254
H/264H).
Buffer memory address
CH1 side CH2 side
Bit position
254
H 264H
b0 RS(RTS)
b1 DR(DSR)
b2 ER(DTR)
b3 CD(DCD)
b4
CS(CTS)
1
b5 CI(RI)
b6 to b15 —
1 System area for QJ71C24 (-R2)
(2) Designation of RS and DTR signal status
The ON/OFF status of the RS(RTS) or ER(DTR) signal, which is normally set
by the Q series C24, can be specified by turning ON/OFF the corresponding bit
in RS and DTR signal status designation (address: 92
H /132H).
1
2
3 4
1 The RS(RTS) signal is controlled by the Q series C24 in the following cases. (Ignore setting
contents.)
• When data is communicated with half-duplex communication
• When communication time and the RS and CS signals are controlled by the modem function
2 The ER(DTR) signal is controlled by the Q series C24 in the following cases. (Ignore setting
contents.)
• When the DTR and DSR signals are controlled
• When data is communicated by the modem function
3 After writing in the buffer memory, a lag of 0 to 20 ms occurs until it is reflected in the signal.
4 When a functional protocol, RS/DTR signal status specification (protocol No. 204 to 207), is
executed with the CPRTCL instruction, the corresponding bit in the RS/DTR signal status
specification (address: 92H/132H) turns on or off.
For functional protocol details, refer to the Operating Manual (Pre-defined protocol support
function).
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