Rohde & Schwarz 1065.6000.20, Operating Manual

Page: 402 / 438

FSE Instrument Interfaces
1065.6016.12 8.9 E-15
Hardware handshake
For hardware handshake, the instrument indicates that it is ready to receive data via the lines DTR and
RTS. A logic ’0’ on both lines means ’ready’ and a logic ’1’ means ’not ready’. The RTS line is always
active (logic ’0’) as long as the serial interface is switched on. The DTR line thus controls the readiness
of the instrument to receive data.
The readiness of the remote station to receive data is reported to the instrument via the CTS and DSR
line. A logic ’0’ on both lines activates the data output and a logic ’1’ on both lines stops the data output
of the instrument. The data output takes place via the TxD line.
Cable for hardware handshake
The connection of the instrument to a controller is made with a so-called zero modem cable. Here, the
data, control and acknowledge lines must be crossed. The following wiring diagram applies to a
controller with a 9-pin or 25-pin configuration.
1
2
3
4
5
6
7
8
9
DSUB connector, 9 poles / female
1
2
3
4
5
6
7
8
9
DSR
RxD
RTS
TxD
CTS
DTR
GND
Instrument Controller / PC
DSR
RxD
RTS
TxD
CTS
DTR
GND
Instrument Controller / PC
1
2
3
4
5
6
7
8
9
DSR
RxD
RTS
TxD
CTS
DTR
GND
1
2
3
4
5
14
15
16
17
6
7
8
9
18
19
20
21
10
11
12
22
23
24
13
25
TxD
RxD
RTS
CTS
DSR
GND
DTR
DSUB connector, 9 poles / female
DSUB connector, 9 poles / female
DSUB connector, 25 poles / female
Fig. 8-4 Wiring of the data, control and acknowledge lines for hardware handshake