Digital Electronics Corporation PL-3700T Series Руководство по установке - Страница 9

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External Interfaces

• This PL unit's serial port is not isolated.
When the host (PLC) unit is also not
isolated, and to reduce the risk of dam-
aging the RS-232C/RS-422/RS-485
circuit, be sure to connect pin #5 SG
(Signal Ground) terminal.
• Never connect NC to COM1.
• Connect FG to shell.
Serial Interface
(COM1, COM2, COM3, COM4)
Interfit Bracket #4-40 UNC
COM1, COM2, COM3, COM4
Pin #
Signal Name
1
CD
2
RD(RXD)
3
SD(TXD)
4
ER(DTR)
5
SG
6
DR(DSR)
7
RS(RTS)
8
CS(CTS)
9
CI(RI)/+5V
Shell FG
*1 Only COM1 and COM2 are available for
switching to +5 V. COM3 and COM4 are used
exclusively for CI (RI).
*2 Slide switch on the circuit board in the PL unit
switches between CI (RI) and +5 V. For
details, see [Internal Switches].
RS-232C
Meaning
Carrier Detect
Receive Data
Send Data
Data Terminal Ready
Signal Ground
Data Set Ready
Request to Send
Clear to Send
Called status display/
+5V Output 0.5A
Frame Ground
(Common with SG)
COM1
Pin #
Signal Name
1
RDA
2
RDB
3
SDA
4
ERA
5
SG
6
CSB
7
SDB
8
CSA
9
ERB
Shell FG
Pin #
Signal Name
1
DATA +
2
DATA -
3
NC
4
NC
5
SG
*1 *2
6
NC
7
NC
8
NC
9
NC
Shell FG
*3 To change the communication method, set
the dip switch located on the circuit board in
the PL unit to the desired position.
For details, see [Internal Switches].
9
*3
RS-422
Meaning
Receive Data A(+)
Receive Data B(-)
Send Data A(+)
Data Terminal Ready
A(+)
Signal Ground
Clear to Send B(-)
Send Data B(-)
Clear to Send A(+)
Data Terminal Ready
B(-)
Frame Ground
(Common with SG)
*3
RS-485
Meaning
Send/Receive Data
(+)
Send/Receive Data
(-)
No Connection
No Connection
Signal Ground
No Connection
No Connection
No Connection
No Connection
Frame Ground
(Common with SG)