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Serial Port Configuration
Configuration
4-8
4.3.3 Baud Rate
The MSS and the attached serial device must agree on a speed, or baud rate, to use for the
serial connection. Valid baud rates for the MSS are 300, 600, 1200, 2400, 4800, 9600 (the
default), 19200, 38400, 57600, 115200, and 230400 baud. The baud rate can be changed
with the Change Speed command followed by a baud rate number.
Figure 4-16: Changing the Baud Rate
The MSS supports Autobaud, which allows the serial port to match its speed to the attached
serial device upon connection (see Change Autobaud in the Device Server Reference
Manual for an explanation of the baud rate negotiation process). Autobaud is disabled by
default, but can be enabled with the following command.
Figure 4-17: Enabling Autobaud
4.3.4 Character Size, Parity, and Stop Bits
The default character size of 8 data bits can be changed to 7 data bits. Similarly, the default
stop bit count of 1 bit can be changed to 2 bits. Parity is normally None, but can also be
Even, Mark, Odd, or Space. To change these parameters, use the following commands.
Figure 4-18: Configuring Serial Port Parameters
Note:
If the MSS is set to 8 bit characters, parity must be set to none.
4.3.5 Flow Control
Both RTS/CTS (hardware) and XON/XOFF (software) flow control methods can be used
on the MSS. RTS/CTS controls data flow by sending serial port signals between two
connected devices. XON/XOFF controls data flow by sending particular characters
through the data stream: Ctrl-Q to accept data (XON) and Ctrl-S when data cannot be
accepted (XOFF).
Note:
Applications that use Ctrl-Q and Ctrl-S will conflict with XON/XOFF
flow control, in which case RTS/CTS is recommended.
Local>> CHANGE SPEED 19200
Local>> CHANGE AUTOBAUD ENABLED
Local>> CHANGE CHARSIZE 7
Local>> CHANGE STOPBITS 2
Local>> CHANGE PARITY EVEN