14
W&T
RS232(/RS422/RS485) Multi Computer Adapter
If the T-switch receives an XOFF code or detects a block level
(negative level) on the hardware handshake input, it stops
sending data on the corresponding port no later than one byte
after this state is detected. If the T-switch receives an XON code
or detects an enable level (positive level) on the hardware
handshake input, it resumes sending data.
The XON and XOFF codes are used only for the handshake;
these codes are not data and are also not allowed to be
contained in the user data. If a hardware handshake is used
however and the T-switch is correspondingly configured, the
XON and XOFF codes are treated as normal data.
When hardware handshake inputs are open or improperly wired,
the T-switch may send no data on the affected port.
If you use only software handshake and configure the
T-switch accordingly, this problem will of course not occur.
Setting the format - DIL switches
The DIL switch banks SW1, SW2 and SW3 have the same
scope of functions for all three ports: the individual switches
determine the transmission speed, the number of data bits, the
parity and the handshake procedure of the respective port. The
function of the individual switches can be seen in the following
tables:
handshake
S1
data bit
S6
hardware handshake
off
7 data bit
off
software handshake
ON
8 data bit
ON
parity
S7
S8
no parity
X
off
odd parity
off
ON
even parity
ON
ON