20Ma-Tty Interface On The Cp 340-20Ma-Tty - Siemens SIMATIC CP 340 User Manual

Product Description
1.4 Properties of the serial interface
1.4.2 20mA–TTY interface on the CP 340–20mA-TTY
Definition
The 20mA-TTY interface is a current-loop interface used for serial data transmission.
Features
The 20mA-TTY interface has the following features and meets the following requirements:
Type:
Front connector:
20mA TTY signals
Max. baud rate:
Max. cable length:
Standard:
Degree of protection:
20
Current-loop interface
9-pin sub D socket with screw-locking
Two isolated 20 mA current sources, receiving loop (RX) "–" and "+" send
loop (TX) "–" and "+"; all isolated from the S7-internal power supply
Baud rate: 9.6 kbps
100 m active, 1000 m passive;
Cable type LIYCY 7 x 0.14
DIN 66258 Part 1
IP 00
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03