SSCI HSS4NG, User Manual, Page: 20 / 34

Name Options Description
CCII/HSS8/6-MAN/004 2009-08-31 Issue 1.2
CH8MAN04.WPD
Page 12 of 26
Freeze Transmit Pause (freeze) transmission.
Transmission continues when set
back to normal.
RX with no stopbit
If set, the receiver receives data
without stop bits.
Sync. Mode Select asynchronous (normal) or
synchronous mode.
Disable RX while TX
Enable (normal) or disable receiver
while transmitting. Used in
multidrop mode to prevent
reception of own messages.
D i s a b l e P a r i t y
Checking
Enable or disable parity checking.
TX parity, RX parity
ODD
LOW
EVEN
HIGH Receive and transmit parity. Parity
will only be checked if parity is
enabled.
Diagnostics Mode NORMAL Normal operation. Use this
for
external loopback .
Set diagnostic mode.
External loopback - RS-422/485 :
Connect TxD+ to RxD+, TxD- to
RxD-, ( to CLKIN+ and
CLKOUT- to CLK_IN- for
synchronous mode).
External loopback - RS-232 :
Connect TxD to RxD, (CLK_OUT to
CLK_IN for synchronous mode) and
RTS to CTS and CD.
LOOPBACK
Internal loopback :
T x D a n d R x D a r e
connected internally. The
value on RxD, CTS and CD
is ignored. The transmitter
and receiver share the
same clock source.
ECHO T h e t r a n s m i t t e r
automatically resends
received data bit-by-bit.
LOOPBACK_ECHO L o o p b a c k a n d e c h o
o p e r a t i o n o c c u r
simultaneously.
Max. RX Bytes 1 to 16 384 (default) Maximum number of bytes that may
be copied into a buffer.
Max. Idle Characters
0 to 16 384 (default) Maximum idle characters. When a
character is received, the receiver
begins counting idle characters. If
max_idl idle characters are
received before the next data
character, an idle timeout occurs
and the buffer is closed. Thus,
max_idl offers a way to demarcate
frames.
To disable the feature, clear
max_idl. The bit length of an idle
character is calculated as follows:
1 + data length (5-9) + 1 (if parity is
used) + number of stop bits (1-2).
For 8 data bits, no parity, and 1 stop
bit, the character length is 10 bits.
Break Characters 0 - 2 048 Number of break characters sent by
transmitter. For 8 data bits, no
parity, 1 stop bit, and 1 start bit,
each break character consists of 10
zero bits.
Address1, Address2
0x0000 - 0x00FF Address in multidrop mode. Only
the lower 8 bits are used so the
upper 8 bits should be cleared.