VEGA Phoenix PSI Data Fax Modem - Manual (Page 43)

Hardware Installation
692302 3-11
Figure 3-6 RS-232 interface
Table 3-2 Meaning of the terminal designations
Designation Meaning
DCD (Data Carrier Detect) Data carrier detected, connection
established
TxD (Transmit Data) Transmit data (refers to PC, PLC, etc.)
RxD (Receive Data) Receive data (refers to PC, PLC, etc.)
RTS (Request To Send) Request to send
CTS (Clear To Send) Clear to send
DTR (Data Terminal Ready) Ready (PC, PLC, etc.)
DSR (Data Set Ready) Ready (modem)
RI (Ring Indicator) Incoming call
GND (Signal Ground) Signal ground
3 2 3
2 3 2
7 4 7
8 5 8
4 2 0 4
6 6 6
5 7 5
T x D
R x D
R T S
C T S
D T R
D S R
G N D
T x D
R x D
R T S
C T S
D T R
D S R
G N D
S U B D
2 5 9
S U B D 9
6 9 2 3 A 0 3 5
M a x . 1 5 m
( 4 9 . 2 1 f t . )
9 2 2 9 R I R I
1 8 1 D C D D C D
P C / P L C M o d e m