20Ma-Tty Interface Of The Cp 341-20Ma Tty; Table 1- 5 Rs 232C Interface Signals - Siemens Simatic S7-300 CP 341 User Manual

RS 232C signals
The following table shows the meanings of the RS232C accompanying signals.
Table 1- 5 RS 232C interface signals
Signal Designation
TXD Transmitted Data
RXD Received Data
RTS Request To Send
CTS Clear To Send
DTR Data Terminal Ready
DSR Data Set Ready
RI Ring Indicator
DCD Data Carrier Detect
1.4.2

20mA-TTY interface of the CP 341-20mA TTY

Definition
The 20mA-TTY interface is a current-loop interface used for serial data transmission.
Properties
The 20mA-TTY interface has the following properties and meets the following requirements:
Type:
Front connector:
20mA TTY signals:
Max. baud rate:
Max. cable length:
Standard:
The switch from active to passive is made possible through appropriate wiring on the cable
1)
connector.
CP 341 Point-to-Point Communication, Installation and Parameter Assignment
Manual, 09/2008, A5E02191071-01
www.gkbpx.com
Meaning
Transmitted data; Transmission line is held by CP 341 on logic "1" in idle state.
Received data; Receive line must be held on logic "1" by communication partner.
RTS "ON": CP 341 ready to send
RTS "OFF": CP 341 is not sending
Communication partner can receive data from the CP 341. The communication
processor expects the signal as response to RTS "ON".
DTR "ON": CP 341 is switched on and ready for operation
DTR "OFF": CP 341 is not switched on and is not ready for operation
DSR "ON": Communication partner is switched on and ready for operation
DSR "OFF": Communication partner is not switched on and not ready for operation
Incoming call on connection of a modem
Carrier signal on connection of a modem
Current-loop interface
9-pin subminiature D female with screw interlock
two isolated 20 mA current sources, receive loop (RX) "-" and "+" transmit
loop (TX) "-" and "+"; all isolated against the S7-internal power supply
(S7-300 backplane bus) and the external 24 V DC supply
19.2 kbaud
1000 m active at 9.6 kbaud
at 9.6 kbaud (partner supplies the current loop), 500 m active, 500 m
1)
passive at 19.2 kbaud; cable type LIYCY 7 x 0.14 (6ES7902-2Ax00-0AA0)
DIN 66258 Part 1
1.4 Properties of the Serial Interface
(CP supplies the current loop), 1000 m passive
1)
该文档是极速PDF编辑器生成，
如果想去掉该提示,请访问并下载：
http://www.jisupdfeditor.com/
Product Description
25