User`s manual

Communications Menu
MS-3000 Single Head Decoder User’s Manual
2-7
2–Menu Config.
Point-to-Point
with XON/XOFF
(Transmitter On/Off)
Used only with RS-232
or RS-422
.
This selection
enables the host to send a single byte
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
with RTS/CTS
and XON/XOFF
Used only with RS-232. It is a combination of Point-
to-Point with RTS/CTS and Point-to-Point with
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.
Multidrop
a
Similar to Polling Mode D except that a unique poll
address and select address are required for each
multidrop device, and only one host port connection
is needed for up to 50 devices. (For Multidrop poll
and select characters, see Table A-6, “Multidrop
Address Characters,” on page A-20.)
Requires a concentrator or controller using RS-485
communications. When Multidrop is selected, the
protocol characters for RES, REQ, etc. are
assigned automatically. (See “Appendix I —
Multidrop Communications” on page A-17 for
poll and select sequences.)
Selecting: Has this effect:
Note: Decoders in-
tended to link up to a
MS-5000 multidrop
concentrator can
only be configured in
standard Multidrop
protocol.
Hint: Attach a tag to
each decoder to
identify its multidrop
address.