AR 10052412, Operating And Service Manual

Page: 48 / 80

Model 5000A225C
24 Rev A
2.8.1 IEEE-488 (GPIB) Communication
For GPIB operation, the device address is set using the front panel touch screen. For more information about
setting the GPIB address, see the GPIB Address Screen section.
Ensure that each device connected to the GPIB is set to a unique address.
When sending commands via the GPIB interface, terminate commands with an EOI and a Line Feed character.
2.8.2 RS-232 Communication
The RS-232 port is a serial communications bus. When a valid query is received, it is processed, and the result
is immediately transmitted back over the RS-232 interface.
Once the first character of a new command or query has been transmitted to the amplifier, any pause between
a subsequent character (or the termination character) greater than 5 seconds will result in the internal buffer
being cleared and a TIMEOUT_ERROR<LF> message being sent out on this port.
The baud rate for the RS-232 port is user selectable from the RS-232/Fiber-Optic Serial Baud Rate selection
screen. For more information, see Local User Interface section of this document.
NOTE: This baud rate setting is shared by both the RS-232 port and the Fiber-Optic serial port.
The RS-232 port is setup as a Data Circuit-terminating Equipment (DCE) port. When connecting to a Personal
Computer (PC) a straight one-to-one cable should be used. A null modem is NOT needed. The settings and
pin-out diagram for this port can be found below.
Table 2-1. RS-232 Port Settings
Word Length 8 bits
Stop Bits: 1
Baud Rate: User selectable (default is 19200)
Parity: None
HW Handshake: None
The RS-232 port is setup as a Data Circuit-terminating Equipment (DCE) port. When connecting to a Personal
Computer (PC) a straight one-to-one cable should be used. A null modem is NOT needed. The pinout diagram
for this port can be found below.
Table 2-2. RS-232 (DCE) Port Pin-out Diagram DB-9 Female
Pin 1 DCD
Pin 2 TD
Pin 3 RD
Pin 4 DTR
Pin 5 GND
Pin 6 DSR
Pin 7 CTS
Pin 8 RTS
Pin 9 Unused