RFL SMX3/40 Page 12 of 24 Issue 2.02
User Manual
07 May 2009
DIP Switch 1 – 4 settings:
Switches 1 to 4 correspond to V24 ports 1 to 4
8 7 6 5 4 3 2 1
Baud Rate
Aggregate
Direction
Mode
Channel Allocation
and Sharing
00 = 1200
00 = X21 Port 00 = Disabled 00 = Ch A
01 = 2400
01 = Concat. Port 01 = Transparent 01 = Ch B
10 = 4800
10 = Both Ports 10 = Async 8 bit 10 = Ch C
11 = 9600
11 = Local Loop 11 = Async 9 bit 11 = Ch D
• Channel Allocation and Sharing: Select aggregate channel A, B, C, D
Each port can be allocated to any channel. More than one port may share a channel.
Where more than one port is allocated to the same channel, the ports share the
channel. From the point of view of one of those ports, Transmit Data would be sent
over the aggregate channel and to all other ports allocated to the same channel. Data
from the aggregate channel or other such port(s) would appear as Received Data.
This feature is useful for supporting SCADA systems where multiple terminals are
attached, but they must be well disciplined where only one terminal transmits at once,
waiting for CTS after asserting RTS.
• Mode: Disabled, Transparent, Async 8 bit, Async 9 bit.
Transparent is used where end-to-end delay is critical and may also be used for
applications where asynchronous character formats are not specifically supported.
The baud rate settings are ignored. (See section 5)
Async 8 bit is selected for: 7 data bits plus 1 parity bit (even or odd).
or: 8 data bits plus 0 parity bit.
Async 9 bit is selected for: 8 data bits plus 1 parity bit (even or odd).
• Aggregate Direction: X21 Port, Concatenation Port, Both Ports.
If X21 Port is selected, traffic on the allocated aggregate channel terminates at this
port. That channel is then available for other traffic over the Concatenation Port.
If Concatenation Port is selected, data on the selected aggregate channel terminates
at this port and that channel is available for other data over the X21 Port. Referring to
Example 4 in Section 14: Data on aggregate channel B terminates at B2.
If Both is selected, traffic on the selected aggregate channel between X21 Port and
Concatenation Port appears at RxD as an 'or' of data from either direction, and TxD is
sent in both directions. As with port sharing described in Aggregate channel
allocation above, this mode is suitable only for a well-disciplined system (where only
one terminal transmits at once), waiting for CTS after asserting RTS.
• Baud Rate: 1200, 2400, 4800, 9600 bits/sec.
When Async 8 or Async 9 mode is selected, set the baud rate to match the
connected equipment. 9600 bits/s requires allocation to a 16kHz sampling channel (ie
channels A, B or C).
Do not set different baud rates for ports allocated to the same aggregate channel.
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