AR 10044005, Руководство по эксплуатации и обслуживанию

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Model 5000A225A
Rev B 21
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. The default baud rate is 19200.
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 pinout 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 Pinout 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
2.4.2.3 Fiber-Optic Serial 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. The default baud rate is
19200.
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 Model
5000A225A. 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.