Proface APL3000B - Node Box PC - Manual (Page 30)

Chapter 2 Specifications
2-7
2.3 Interface Specifications
This section describes the specifications of each interface of the PS-A Series unit.
2.3.1 Serial Interfaces (COM1)
This interface is used to connect an RS-232C (serial) cable. A D-sub 9-pin plug connector is used.
Use #4-40 (UNC) fixing clamps to fix the joint of the interspace.
„ Switch
The RI/5V change switch, corresponding to serial interface, is placed on the board which you opened the fan
cover or the memory slot cover. Refer to the following for more details of how to remove the fan cover or the
memory slot cover.
• The PS-A unit’s serial port is not isolated. When the host (PLC) unit is also not
isolated, be sure to connect the #5 SG (Signal Ground) terminal to reduce the risk
of damaging the RS-232C circuit.
• Inside the PS-A unit, the SG (Signal Ground) and FG (Frame Ground) terminals
are connected.
• When connecting an external device to the PS-A using the SG terminal, be sure
to check that no short-circuit loop is created when you setup the system.
Pin
Arrangement
Pin No.
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)/5V Input
Called status display/+5V Output
(Switching available
*1
)
*1 By the switch on the board of the inside of the unit, it is available to change RI/5V.
Shell FG - Frame Ground (Common with SG)
SEE 3.3.1 Main Memory Installation (page3-13)
• When you switch RI/5V, you must turn off the power supply for PS-A. Otherwise,
it will cause malfunction.
• Prior to the switching action, confirm the interface specification for the other side
of the connection. Otherwise, it will cause malfunction.
9
6
5
1