Microscan MS-3 Manual Book page 42

Protocol
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. "Communication Protocol Commands" on page A-11
Definition: User Defined Multidrop allows the user to customize the polling pro-
tocol.
Usage: This option is used when connecting to a concentrator or other device
that does not match standard multidrop 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: <K140,7,RES,address,REQ,EOT,STX,ETX,ACK,NAK>
For User Defined Multidrop, first select Multidrop <K140,5>, then
User Defined Multidrop <K140,7...>.
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.
Note: Definitions of commands in User Defined and User Defined Multidrop must
be duplicated in host applications to enable poll and select sequences to execute cor-
rectly during 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.
MS-3 Laser Scanner User's Manual
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