Model 800A3B
Rev D
16
button is pushed, the baud rate selection is stored to non-volatile memory. Therefore, if power is lost prior to
hitting the back button, any baud rate selection changes will be lost.
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
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
2.6.3
Fiber-Optic Communication
The Fiber-Optic port is a serial communications bus. All commands and queries through this port must be
terminated with a Line Feed character. When a valid query is received, it is processed and the result is
immediately transmitted back over the Fiber-Optic interface. This port is designed to time-out if there is no
activity on the bus for more than 5 seconds. At this time the internal buffer is cleared and a
TIMEOUT_ERROR
message followed by a Line Feed is sent out from this port.
The baud rate for the Fiber-Optic Serial port is user selectable from the RS-232/Fiber-Optic Serial Baud Rate
selection screen. To get there from the Main Menu, touch the User menu button followed by the I/O menu
button and finally the Serial menu button. A thin black outline indicates the present baud rate selection.
When the back button is pushed, the baud rate selection is stored to non-volatile memory. Therefore, if power
is lost prior to hitting the back button, any baud rate selection changes will be lost.
NOTE: This baud rate setting is shared by both the Fiber-Optic serial port and the RS-232 port.
The Fiber-Optic port provides the user with the ability to optically isolate the controlling PC from the
amplifier. This can be useful in an environment where RF/Microwave energy could be coupled onto a
connection to one of the “wired” communications ports and fed back to the controlling PC.
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