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3-8 Receiving & Installation MN1854
Daisy Chain Connections
LinStep+ can support daisy chaining. The unit address (range 1–99) can be set
with the keypad, through Application Developer, or with a terminal program using
the Unit Number (UN) command, or the entire chain may be addressed at once
using the Auto–Address (AA) command. Connect as shown in Figure 3-8.
Rules for Daisy Chain Operation
1. All LinStep’s in a daisy chain must have their device address assigned in
ascending order away from the host device. This allows the Load All (LA
– EX) commands to work properly. Addresses do not have to be
sequential, but must be in ascending order.
Example: 1, 2, 4, 6, 8 is valid addressing. 6, 3, 10, 8, 2 is not valid.
2. Do not duplicate unit addresses.
3. RS–232C “Echo” should be turned on for each unit in the daisy chain.
Disabling RS–232C Echo will prevent daisy chain operation.
4. All RS–232C connections must be correctly made.
5. “Device Addressing” RS–232C commands (for a specific LinStep+
device) must have the correct address specified in the command.
6. Status commands require the correct address.
Figure 3-8 Daisy Chain Connection
PC / Host
Device
RXD
TXD
GND
LinStep+
Unit 1
RXD
TXD GND
LinStep+
Unit 2
RXD
TXD GND
LinStep+
Unit 3
RXD
TXD GND