Rohde & Schwarz 1094.0006.50, Operating Manual

Page: 197 / 374

CTS55 Interfaces/Annex A
1094.0006.55 A.1 E-3
Serial Interface
The instrument is equipped with a serial interface (RS-232-C) as standard. The 9-pin connector is
located at the rear of the instrument. A controller for remote control can be connected via the interface.
The connection is effected using a zero modem cable.
For remote control via the serial interface, an important aspect is to be noted:
Some controllers already send characters on the serial interface during booting, causing the
instrument to switch to the REMOTE state as soon as it receives these characters (since no explicit
addressing is possible with the serial remote control).
Characteristics of the Interface
é
serial data transfer
é
bidirectional data transfer
é
Data transfer rate 9600 baud
é
Possible length of connecting cable > 20 m
é
Parameters: 9600, N, 8, 1
XON/XOFF handshake
5
1
6 7 8 9
4 3 2
DCD
RxD
TxD
DTR
SG
DSR
RTS
CTS
RI
Fig. A3-1 RS232 interface
Designation Pin (9-pin) Pin (25-pin)
Data Carrier Detect DCD 1 8
Receive Data RxD 2 3
Transmit Data TxD 3 2
Data Terminal Ready DTR 4 20
Signal Ground SG 5 7
Data Set Ready DSR 6 6
Request To Send RTS 7 4
Clear To Send CTS 8 5
Ring Indicator RI 9 21