HP 6633B - Manual (Page 30)

3 - Installation
30
Controller Connections
The dc source connects to a controller either through an HP-IB or an RS-232 connector.
HP-IB Interface
Each dc source has its own HP-IB bus address, which can be set using the front panel Address
key as described in chapter 5. HP-IB address data is stored in non-volatile memory. The dc source
is shipped with its HP-IB address set to 5.
Dc sources may be connected to the HP-IB interface in series configuration, star configuration, or
a combination of the two, provided the following rules are observed:
♦
The total number of devices including the controller is no more than 15.
♦
The total length of all cables used is no more than 2 meters times the number of devices
connected together, up to a maximum of 20 meters. (Refer to table 2-2 for a list of HP-IB
cables available from Hewlett-Packard.)
♦
Do not stack more than three connector blocks together on any HP-IB connector.
♦
Make sure all connectors are fully seated and the lock screws are firmly finger-tightened.
RS-232 Interface
The dc source has an RS-232 programming interface, which is activated by commands located in
the front panel
Address menu. All SCPI and COMPatibility commands are available through RS-
232 programming. When the RS-232 interface is selected, the HP-IB interface is disabled.
The RS-232 connector is a DB-9, male connector. Adapters are available to connect the dc source
to any computer or terminal with a properly configured DB-25 connector (see Table 2-2).
1 2 3 4 5
6 7 8 9
Figure 3-5. RS-232 Connector
Pin Input/Output Description
1 - no connection
2 Input Receive Data (RxD)
3 Output Transmit Data (TxD)
4 Output Data Terminal Ready (DTR)
5 Common Signal ground
6 Input Data Set Ready (DSR)
7 Output Request to Send (RQS)
8 Input Clear to Send (CTS)
9 - no connection