Microscan MS-3000 User Manual page 33

Selecting: Has this effect:
Point-to-Point Used only with RS-232
enables the host to send a single byte
with XON/XOFF
(Transmitter On/Off) transmission command of start (XON) or stop
(XOFF). If an XOFF has been received from the
host, data will not be sent to the host until the
host sends an XON. During the XOFF phase, the
host is free to carry on other chores and accept
data from other devices.
Point-to-Point Used only with RS-232. It is a combination of Point-
with RTS/CTS to-Point with RTS/CTS and Point-to-Point with
and XON/XOFF XON/XOFF.
Polling Mode D Like Point-to-Point, Polling Mode D requires a
separate connection to the host but unlike Point-to-
Point, it requires the device to have an address and
to wait for a poll from the host before sending data.
When in Polling Mode D, an address 1 is
automatically displayed on the configuration
screen. However, during transmission, a 1C hex
poll address (FS) and a 1D hex select address
(GS) are substituted for the 1.
a
Similar to Polling Mode D except that a unique poll
Multidrop
address and select address are required for each
Note: Decoders in-
multidrop device, and only one host port connection
tended to link up to a
is needed for up to 50 devices. (For Multidrop poll
MS-5000 multidrop
and select characters, see
concentrator can
Address Characters," on page
only be configured in
Requires a concentrator or controller using RS-485
standard Multidrop
communications. When Multidrop is selected, the
protocol.
protocol characters for RES, REQ, etc. are
Hint: Attach a tag to
assigned automatically. (See
each decoder to
Multidrop Communications" on page A-17
identify its multidrop
poll and select sequences.)
address.
MS-3000 Single Head Decoder User's Manual
Communications Menu
or RS-422 . This selection
Table A-6, "Multidrop
A-20.)
"Appendix I —
for
2-7