Specifications

ZVx Interfaces
1043.0009.50 A.5 E-8
A.2 RS-232-C Interface (COM1, COM2)
The standard instrument is equipped with two serial interfaces (RS-232-C). The RS-232-C interfaces
are two independent, remote-control channels, both of which may be active at the same time. The
programming and interrogation commands affect the same instrument hardware. The interfaces can be
set up manually in the SETUP-GENERAL SETUP menu in the COM PORT1/2 table or, via remote
control, switched on/off with the command SYSTem:COMMunication:SERial1|2:STATe.
Each of the active RS-232-C interfaces is assigned to one of the 9-pin connectors located on the rear
panel. Interface 1 is assigned to the connector COM1 and Interface 2 is assigned to the connector
COM2.
Interface Characteristics
é Serial data transmission in asynchronous mode
é Bidirectional data transfer via two separate lines
é Transmission rate selectable from 110 to 19200 baud
é Logic ’0’ signal from+3 V to +15 V
é Logic ’1’ signal from -15 V to -3 V
é An external instrument (controller) can be connected.
é Software handshake (XON, XOFF)
é Hardware handshake
5
1
6789
432
DCD
RxD
TxD
DTR
SG
DSR
RTS
CTS
RI
Fig. A-2 Pin assignment of the RS-232-C interface
Signal Lines
1. Data lines
The data transmission is bit-serial in ASCII code starting with the LSB. Two lines, RxD and TxD are
necessary as the minimum requirement for transmission; however, no hardware handshake is
possible. For handshaking, only the XON/XOFF software handshake protocol can be used .
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.