Proface AGP3500 - 10.4 DIO HMI" - Manual (Page 50)

Chapter 3 Specifications
3-19
3.2.3 Interface Specifications
This section describes the specifications of each interface of the ST Series unit.
„ AST-3301B, AST-3301S, AST-3301T
‹ Serial Interface (COM1)
This interface is used to connect an RS-232C serial cable. A D-Sub 9-pin plug connector is used.
<ST unit side>
<Cable side>
*1 The RI/VCC selection for Pin #9 is switched via software. The VCC output is not protected against
overcurrent. To prevent damage or a unit malfunction, use only the rated current.
• The serial interface of the ST Series (except AST-3302B COM2) does not have
an isolation function. When the host (PLC) unit is also not isolated, be sure to
connect Pin #5 SG (Signal Ground) terminal to reduce the risk of damaging the
RS-232C/RS-422/RS-485 circuit.
• ST Series (except AST-3302B COM2) have the SG (signal ground) connection
and the FG (frame ground) connection inside. When connecting an external
device to the ST using the SG terminal, be sure to check that no short-circuit loop
is created when you setup the system.
• The same type of connector is used for COM1 and COM2 of the ST (except AST-
3302B). Be careful not to mistake one for the other. Connecting them incorrectly
disables communication.
• Connecting the RS-232C isolation unit (CA3-ISO232-01) to COM1 enables isolation if
needed.
ST Connector XM2C-0942-502LX <OMRON Co.>
Interfit Bracket #4-40 inch screws are used.
Recommended Cable Connector XM2D-0901 <OMRON Co.>
Recommended Cable Cover XM2S-0913 <OMRON Co.>
Recommended Jack Screw XM2Z-0073 <OMRON Co.>
Pin
Arrangement
Pin No.
RS-232C
Signal Name Direction Meaning
1 CD Input Carrier Detect
2 RD(RXD) Input Receive Data
3 SD(TXD) Output Send Data
4 ER(DTR) Output Data Terminal Ready
5 SG - Signal Ground
6 DR(DSR) Input Data Set Ready
7 RS(RTS) Output Request to Send
8 CS(CTS) Input Send Possible
9 CI(RI)/VCC Input/-
Called status display
+5V
±
5% Output 0.25A
*1
Shell FG -
Frame Ground
(Common with SG)
9
6
5
1
(ST unit side)