Bosch 6000 User's Guide download pdf (Page 90)

Chapter 2. Communication

RS-485 Multi-Drop (RS-485 Compatible Products Only)

Up to 99 stand-alone 6000 Series products may be multi-dropped. Refer to your product's

Installation Guide for multi-drop connections.

To establish device addresses, using the ADDR command (the 6104 also allows you to set the

device address with DIP switches, providing up to 31 unique addresses):

The ADDR command allows you to establish up to 99 unique addresses. To use the ADDR

command, you must address each unit individually before it is connected on the multi

drop. For example, given that each product is shipped configured with address zero, you

could set up a 4-unit multi-drop with the commands below, and then connect them in a

multi drop:

1. Connect the unit that is to be unit #1 and transmit the Ø_ADDR1 command to it.

2. Connect the unit that is to be unit #2 and transmit the Ø_ADDR2 command to it.

3. Connect the unit that is to be unit #3 and transmit the Ø_ADDR3 command to it.

4. Connect the unit that is to be unit #4 and transmit the Ø_ADDR4 command to it.

If you need to replace a unit in the multi drop, send the Ø_ADDRi command to it, where

"i" is the address you wish the new unit to have.

To send a 6000 command from the master unit to a specific unit in the multi-drop, prefix the

command with the unit address and an underscore (e.g., 3_OUTØ turns off output #1 on unit

#3). The master unit (if it is not a 6000 product) may receive data from a multi-drop unit.

The ECHO command was enhanced with options 2 and 3. The purpose is to accommodate an

RS-485 multi-drop configuration in which a host computer communicates to the “master”

6000 controller over RS-232 (COM1 port) and the master 6000 controller communicates over

RS-485 (COM2 port) to the rest of the units on the multi-drop. For this configuration, the

echo setup should be configured by sending to the master the following commands executed in

the order shown. In this example, it is assumed that the master's device address is set to 1.

Hence, each command is prefixed with “1_” to address only the master unit.

1_PORT2 .. Subsequent command affects COM2, the RS-485 port

1_ECHO2 .. Echo characters back through the other port, COM1

1_PORT1 .. Subsequent command affects COM1, the RS-232 port

1_ECHO3 .. Echo characters back through both ports, COM1 and COM2

NOTE

Controllers on a multi-drop do not support XON/XOFF. To ensure that XON/XOFF is disabled

for COM2, send the PORT2 command followed by the XONOFFØ command.

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Bosch 6000 User's Guide Page 90