Host Protocol Menu
MS-5000 Multidrop Concentrator User’s Manual
3-11
3–Ser
ial
Conf
ig.
be used to access the configuration menus again (although “K” commands will
continue to function).
It is necessary to assign a unique address to the concentrator in Multidrop.
This number (1 to 50) is then displayed on the concentrator’s configuration
screen (see “Polled Device Status Menu” on page 3-15). However during
transmission, poll and select addresses from 1C to 7F hex are substituted
for the displayed decimal values. For example, if a 1 has been assigned as
the Multidrop address, then 1C hex is substituted as the poll address and
1D hex as the select address. (See Table A-4, “Multidrop Address Charac-
ters,” on page A-5.)
When Multidrop is selected, the protocol characters for RES, REQ, etc. are
assigned automatically. LRC (recommended for data transfer security) is
also enabled.
User Defined
Used only with RS-232 or RS-422. User Defined protocol allows you to assign
ASCII characters to the address and/or to protocol commands (RES, REQ,
EOT, STX, ETX, ACK, and NAK) for special applications. User Defined is nec-
essary when defining a new protocol to match a specific host protocol.
You may assign an address to a concentrator in User Defined protocol by
entering any single ASCII character at the address prompt (
except
a NUL).
This will put you in polled mode (but without RS-485). To remain in an
unpolled mode, leave the address blank.
Note
: Never assign the same ASCII character more than once to an address or
protocol command.
When selected, the displayed protocol commands match those of the previ-
ously selected protocol. Thus, to quickly define User Defined protocol, first
select a protocol whose default characters are similar to what you want to de-
fine (for example, Point-to-Point or Polling Mode D), then select User De-
fined. The default characters of the first protocol will load into the new
protocol. You can then modify individual protocol commands (RES, REQ,
etc.,) by assigning any one or two ASCII character. Table 1-5 shows the con-
centrator poll/select protocol commands that can only be changed
1
in User
Defined and User Defined Multidrop.
2
1. To delete any unwanted command, assign a NUL (null) character.
2. Definitions of protocol commands in User Defined and User Defined Multidrop must
match those in host applications to allow communications sequences to execute cor-
rectly.
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...
