Operating instructions

R&S ESCI Instrument Interfaces
1166.6004.12 8.7 E-1
RS-232-C Interface (COM)
The standard R&S ESCI is equipped with a serial interfaces (RS-232-C; COM connector at the rear of
the instrument). The interface can be set up and activated manually in the SETUP-GENERAL SETUP
menu in the COM PORTtable (Selection OWNER = INSTRUMENT).
Interface Characteristics
! Serial data transmission in asynchronous mode
! Bi-directional data transfer via two separate lines
! Transmission rate selectable from 110 to 19200 baud
! Logic '0' signal from +3 V to +15 V
! Logic '1' signal from -15 V to -3 V
! An external instrument (controller) can be connected.
1
5
6789
234
DCD
RxD
TxD
DTR
SG
DSR
RTS
CTS
RI
Fig. 8-5 Pin assignment of the RS-232-C interface
Signal Lines
DCD (Data Carrier Detect),
Not used in R&S ESCI.
Input; active LOW.
Using this signal, the local terminal recognizes that the modem of the remote station receives valid
signals with sufficient level. DCD is used to disable the receiver in the local terminal and prevent
reading of false data if the modem cannot interpret the signals of the remote station.
RxD (Receive Data)
Input, LOW = logic '1', HIGH = logic '0'.
Data line, local terminal receives data from remote station.
TxD (Transmit Data)
Output, LOW = logic '1', HIGH = logic '0'.
Data line, local terminal transmits data to remote station.
DTR (Data Terminal Ready),
Output, active LOW,
Indicates that the local terminal is ready to receive data.
GND
Interface ground, connected to instrument ground