Data Channels and Switching Configuration
NetRunner W
AN User’s Manual
5-18
Code Level and Parity Conversion
The unit's code level includes parity in its data bits as shown in the following
table.
Unit
Actual
Code Level
1
Parity
Data Bits
Parity Bit
2
9
E,O
8
E,O
8
N
8
N
8
E,O,M,S
7
E,O,M,S
7
N
7
N
7
E,O,M,S
6
E,O,M,S
6
N
6
N
6
E,O,M,S
5
E,O,M,S
5
N
5
N
Key:
E
=
Even
O =
Odd
M =
Mark
S
=
Space
N =
None
1
includes parity bit
2
N = no parity bit; E, O, M, S = 1 bit
The code level on each side of the channel (local and remote ports)
D
must be the same
D
must match the attached devices.
Note:
If you select a code level of 5 or 6: ABR (data rate) and XON/XOFF (flow
control) is not supported. For code level 5, you must set the parity to
none
.
Parity Conversion
Parity conversion is supported for all switched and forceconnected async
ports (Release 3.0 and later). Space, mark, even, and odd need not match on
the local and remote end of the channel. Parity errors will be detected on
channels configured for
odd
or
even
parity regardless of the code level; those
characters will be discarded. Channels with characters configured for
mark,
space
or
none
will be forwarded, even if received in error.
Important
To interface and remain transparent with a MICOM mux or
a Release 2.5 unit, both ends of the channel must have
the same code level and parity (parity conversion is not
supported). Additionally, the devices at each end
must
match.
