
4. Select the HP-IB Address field with the KNOB and press the SELECT key.
5. When the pop-up field appears on screen, rotate the KNOB to select the
desired HP-IB address.
6. Press the SELECT key to enter the new address.
7. Select the DONE field in the upper-right corner with the KNOB to exit the
External I/O Port Configuration menu.
RS-232-C
Interface
The HP 1650B/51B interfaces with RS-232-C communication lines through a
standard 25 pin D connector. The HP 1650B/51B is compatible with RS-232-C
protocol. When a hardwire handshake method is used, the Data Terminal Ready
(DTR) line (pin 20 on the Computer/Modem connector) is used to signal whether
space is available in the logical I/O buffer for more data. Pin outs of the RS-232-C
connectors are listed in table 2-4.
Figure 2-4. External I/O Port Configuration Menu
HP 1650B/1651B Installation
Service Manual 2-7
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