Configuring the interface
By using the front-panel menus, the RS-232-C interface can be placed in
either the printer mode or the computer mode. The printer mode should be
used when you want the instrument to talk directly to a printer over
RS-232-C without the aid of a computer. The controller mode is used when
the instrument will operate with a computer over RS-232-C. Figure 3 is the
logic analyzer Print/Utility menu after the RS-232-C interface module has
been installed on the rear panel. Use this menu to “Connect to Computer,”
and assign the baud rate and handshake protocol. The HP 54652B module
has a slightly different set of menus.
Print/Utility Menu with HP 54651A RS-232 Interface Module Installed
Interface capabilities
The baud rate, stop bits, parity, handshake protocol, and data bits must be
configured exactly the same for both the controller and the logic analyzer to
properly communicate over the RS-232-C bus. The analyzer RS-232-C
interface capabilities are as follows:
•
Baud Rate: 1200, 2400, 9600, or 19.2 k
•
Stop Bits: 1
•
Parity: None
•
Handshake Protocol: DTR or XON/XOFF
•
Data Bits: 8
Handshake Protocol
DTR (Data Terminal Ready)
With a three-wire interface, selecting
DTR for the handshake protocol does not allow the sending or receiving
device to control data flow. No control over the data flow increases the
possibility of missing data or transferring incomplete data.
Figure 3
Programming over RS-232-C
Configuring the interface
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