Panasonic LP-M Series Maintenance Manual page 125

„ Connecting to external control devices
• To connect the laser marker to the PC for control, use a commercially available RS-232C cross cable (9-pin).
• In case of connecting to PLC, a type of the cable (straight or cross) differs depending on a manufacturer or a model.
Please follow the PLC manual.
• To connect RS-232C terminal without using a commercially available RS-232C cable, connect only 3 signals of RxD,
TxD and GND and do not use other signals on the laser marker side.
• The external controller may need a signal line connection (loop back line) other than RxD, TxD, or GND on the external
control device side depending on the specifications of the external control device. Read the instruction manual of the
external control device and connect it to the laser marker appropriately.
Connection example
RS-232C connector
* The loop back wiring on the external control device side shown in the above figure is just an example. The wiring
method varies depending on the specifications of each external control device. Read the instruction manual of the
external control device and connect it to the laser marker appropriately.
„ RS-232C communication conditions
Item
Synchro system
Communication
Baud rate
Data length
Parity
Stop bits
Flow control
Check sum
Delimiter
Start code
Reception timer
• For the details of the setting method of communication conditions, refer to "3-2-2 Communication condition setting"
(P.75).
(Laser marker)
Terminal No.
Signal
2 RxD
3 TxD
5 GND
RS-232C communication conditions
Start-stop method
Full-duplex transmission
1200 / 2400 / 4800 / 9600 / 19200 / 38400 bps (initial setting: 9600 bps)
8-bit fixed
None / Even / Odd (initial setting: None)
1-bit / 2-bit (initial setting: 1-bit)
None
OFF / ON (initial setting: OFF)
CR / CR + LF (initial setting: CR)
• Setting request, Reading request, Reading response: STX
• Normal response: ACK
• Abnormal response: NAK
Timeout monitoring ON (10 sec.)
ME-LPM-SSM-10
External controller
Signal
Cross cable
RxD
TxD
GND
DCD
DTR
DSR
*
RTS
CTS
Terminal No.
2
3
5
1
4
6
7
8
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