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- 7N2 - 7 char bits, no parity, 2 stop bits
- 7E2 - 7 char bits, even parity, 2 stop bits
- 7O2 - 7 char bits, odd parity, 2 stop bits
- 8N1 - 8 char bits, no parity, 1 stop bit (DEFAULT)
- 8E1 - 8 char bits, even parity, 1 stop bit
- 8O1 - 8 char bits, odd parity, 1 stop bit
- 8N2 - 8 char bits, no parity, 2 stop bits
- 8E2 - 8 char bits, even parity, 2 stop bits
- 8O2 - 8 char bits, odd parity, 2 stop bits
•
Hw Flow Control - Hardware flow control enable/disable (DEFAULT) using RTS/CTS
lines
•
Vmin - Receive Buffer Size - The minimum number of data bytes that will be buffered by
the serial port before handling of the data to be processed by the terminal server. (255 =
DEFAULT).
•
Vtime - Receive Inter-Byte Timeout - The amount of time between bytes of data on the
serial port (in multiples of 1 millisecond), that indicate the end of a serial message ready
to be processed by the terminal server. (100 = DEFAULT)
and
Vmin
SD payload or diagnostics (DLINK) port,
Serial Hardware Flow Control
When serial port is not being used as a SD payload or SD diagnostics (DLINK) port:
•
Hardware Flow Control
are required to be set to the same baud rate, and that VMIN and VTIME remain at the
defaults for serial data packets less than or equal to 255 bytes. For serial packets over 255
bytes it is recommended that a cts-delay time of at least 90ms be used to account for the
VTIME delay of the over-the-air sending unit.
Hardware Flow Control Modes
When port is not being used as a SD payload or SD diagnostics (DLINK) port:
•
DCE
- CTS follows RTS after a programmable
- If the unit's input buffer approaches a full condition it can deassert CTS
regardless of state of RTS.
•
CTSKEY
- Based on legacy MDS devices including TransNET, the device will act similar to
a DTE but will provide signaling on the CTS line instead of the RTS line.
- When the first character of a transmission is ready to be sent to the serial port, the
unit shall assert CTS and delay for
first character.
- After the last character of a transmission is output from the serial port, the unit
shall keep CTS asserted until the expiration of
•
CTSKEYPLUS
36
setting only have an effect when the serial port is not being used an
Vtime
: When operating in CTSKEY mode, all serial ports in the data path
MDS™ Master Station
.
CTS delay
expiration before outputting the
CTS delay time
CTS hold time
.
MDS 05-6399A01, Rev. F
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