Chapter 3
Menu Configuration
3-10
MS-5000 Multidrop Concentrator User’s Manual
3–Ser
ial
Conf
ig.
concentrator has an address and waits for a request from the host before
transmitting data.
Note
: Protocols defined in the concentrator apply to communications between
the concentrator and host, or the concentrator and a higher level concentrator.
Point-to-Point
Has no address and transmits data to the host whenever it is available,
without any request or handshake from the host.
Point-to-Point with RTS/CTS (Request-to-Send/Clear-to-Send)
Used only with RS-232. This is a simple handshaking protocol that allows a
concentrator to initiate data transfers to the host with an RTS (request-to-
send) transmission. The host, when ready, responds with a CTS (clear-to-
send) and the data is transmitted. RTS and CTS signals are transmitted over
two dedicated wires as defined in Table 1-3 on page 1-9.
Point-to-Point with XON/XOFF (Transmitter On/Off)
Used with RS-232 or RS-422. This selection enables the host to transmit 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 transmits 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 & 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 channel to the host
but unlike Point-to-Point, it requires the concentrator to have an address
and to wait for a poll from the host before transmitting 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. (See
Table A-4, “Multidrop Address Characters,” on page A-5.)
Multidrop
Multidrop is only enabled in the concentrator when the protocol between the
host and concentrator or between a concentrator and a higher level concen-
trator is intended to be RS-485 Multidrop and an address is assigned to the
concentrator.
Note:
Once the concentrator is configured to Multidrop, a profile card (using
mode 0), a terminal connected to the auxiliary port, or a default procedure must
Summary of Contents for MS-5000
Page 1: ...MS 5000 Multidrop Concentrator User s Manual P N 83 005000 REV J...
Page 8: ...viii MS 5000 Multidrop Concentrator User s Manual...
Page 52: ...Chapter 3 Menu Configuration 3 18 MS 5000 Multidrop Concentrator User s Manual 3 Serial Config...
Page 66: ...Chapter 4 Serial Commands 4 14 MS 5000 Multidrop Concentrator User s Manual 4 Operations...
Page 90: ...A 14 MS 5000 Multidrop Concentrator User s Manual Appendices...
