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Configuring Modicon SA85/SA85-002 Cards, Bridge Multiplexer 85 and Bridge Plus 85

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Topic#: 000306
Created: May 9, 1997

This Tech Note describes how to configure the Modicon SA85/SA85-002 adapter cards, the Modicon Bridge Multiplexer 85 (BM85) and the Modicon Bridge Plus 85 (BP85).

Configuring Modicon SA85/SA85-002 Adapter Cards

The Modicon SA85/SA85-002 adapter cards allow a computer to act as a master node and can enable a Modbus Plus I/O Server to communicate to nodes and slave devices on the Modbus Plus network. The difference between the SA85 and SA85-002 adapter cards is that the SA85-002 adapter card contains dual ports for redundancy on the Modbus Plus network. To configure the SA85/SA85-002 adapter cards, set the adapter jumper for Polled Mode and set two DIP switches: one that defines the network node address and one that sets the memory base address.

Setting the DIP Switches for the Network Node Address

To define the node address for an SA85/SA85-002 adapter card, set the network address DIP switches on the card to the desired address. The following diagrams show the location of the network address DIP switches for the SA85/SA85-002 adapter cards.

SA85 Adapter Card

SA85-002 Adapter Card

A switch is considered to be in position ‘1’ when it is set toward the numbers on the DIP switch. Likewise, a switch is considered to be in position ‘0’ when it is set away from the numbers on the DIP switch. Use switches 1 through 6 to set the node address. Note that switches 7 and 8 are not used. The following diagram shows the numbered DIP switches and a combination of settings that can be used to set an SA85/SA85-002 adapter card node address between 1 and 64.

Note Modicon recommends not setting the SA85/SA85-002 adapter cards to address 1 or 64. Using address 1 could create confusion if a local default address of 1 is used at a controller node’s programming panel. Address 64 should be reserved for network maintenance.

Setting DIP Switches for the Memory Base Address

The SA85/SA85-002 adapter cards should use a memory area in the computer that does not conflict with other boards in the computer. Use the memory base address switches to define the address for the memory area, as seen in the following diagrams:

SA85 Adapter Card

SA85-002 Adapter Card

The following table shows the possible memory base configurations that can be set by these switches:

Configuring the Bridge Multiplexer 85

A set of switches on the rear panel of the Bridge Multiplexer 85 (BM85) allow you to configure the serial ports and set the Modbus Plus node address. The Bridge Multiplexer contains non-volatile memory that will store the port configurations after the unit is turned off.

• Switch 1 puts the Bridge Multiplexer into configuration mode or run mode;
• Switches 2 and 3 define which port on the Bridge Multiplexer will connect to the serial terminal program, such as the Windows Terminal;
• Switches 4 through 7 set the baud rate and parity mode to match the terminal emulation program settings. Always use 8 data bits and 1 stop bit when communicating to the device;
• Switch 8 should be left in an upright position.

The following diagrams show the location of the switches on the rear panel and the settings you should use to configure the Bridge Multiplexer serial ports. Make sure that the Bridge Multiplexer is turned off before you set the switches.

Configuring the Serial Ports

To configure the serial ports, connect a terminal emulation program, such as Windows Terminal, to one of the Bridge Multiplexer ports. The Bridge Multiplexer does not need to be connected the Modbus Plus Network. Use a null modem cable to connect the serial port on the computer to the defined port on the Bridge Multiplexer. The null modem cable could be a minimum pin-out which only uses three lines: transmit, receive and ground; or it could be a ‘full-handshake’ which uses all signals.

When the terminal emulation program has established communication with the Bridge Multiplexer, it will display a screen similar to the following:

After the terminal emulation program displays this screen, you may configure the Bridge Multiplexer serial ports. (See the Modicon Modbus Plus Network BM85 Bridge Multiplexer User’s Guide or contact Modicon for any questions about configuring the Bridge Multiplexer or using the terminal emulation program.) Once the serial ports are configured appropriately, run the Bridge Multiplexer to use the new settings.

Note The Modbus Plus I/O Server can only communicate through a serial port that is configured as either a ‘Network’ or ‘Slave.’

Configuring the Bridge Multiplexer Modbus Plus Address

Use switches 1 through 6 on the rear panel of the Bridge Multiplexer to set the Modbus Plus address. Be sure not to use switches 7 and 8. The following diagram and table illustrate the location of the switches and the switch settings that can be used to set the Modbus Plus address.

Configuring the Bridge Plus 85

To assign the network addresses for the Bridge Plus 85 (BP85), use switches 1 through 6, located on the unit's rear panel. Be sure not to use switches 7 and 8. The following diagram and table illustrate the location of the network address switches and the switch settings for the addresses that you will assign to the Bridge Plus 85.