Microscan MS-710, User Manual, Page: 38 / 186

RS-232/422 Host Port
3-8
MS-710 Scanner User’s Manual
3–Communicat
io
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User Defined Multidrop
Note: Any ASCII character except a null (00) and a ^A (01) can be assigned as an
address. Control characters can be used to define RES through NAK in serial com-
mands. See (See “Communication Protocol Commands” on page A-18. ) Note:
Definitions of commands in User Defined and User Defined Multidrop must be dupli-
cated in host applications to enable poll and select sequences to execute correctly dur-
ing transmission.
Note: Typically, parameters in User Defined Multidrop are defined by first enabling
Multidrop, then enabling User Defined Multidrop. This pre-loads multidrop charac-
ters into the parameters. Then changes are made to individual characters to match the
host or other requirements.
Usage: Used when connecting to a concentrator or other device that does not
match standard multidrop protocol.
Definition: User Defined Multidrop allows the user to customize the polling protocol.
If selecting
User Defined Multidrop (7), complete the format by either
choosing new parameters or place commas where unchanged data fields
occur.
Serial Cmd: < Kf7 ,RES,address,REQ,EOT,STX,ETX,ACK,NAK>
For User Defined Multidrop, first select Multidrop <K5> , then User
Defined Multidrop <K7...> .
Address: Any single character (02 hex to 7E hex) in the ASCII table can be
assigned as the address character. The character chosen is used as the
poll character and the subsequent ASCII character becomes the select
character. For example, if a ^B (02 hex) is selected as the address, ^C
(03 hex) becomes the select address that the host will use in sending
host select commands.