Using the Vmse on an RS-422/485 Multidrop Network

Serial Line Interfaces

Using the VMSE on an RS-422/485 Multidrop Network

The following figure shows an acceptable configuration for a multidrop network. This example shows only two slave devices; if additional slaves were added, termination would be required at the last slave device instead of at Slave #2.

Master

Slave #1

Slave #2

Serial Switch=**

VMSE #1

Ethernet Cable

	Serial
Switch=RS-422	Line 2

VMSE #2

Termination is required across RD or RX terminals at these locations if the serial line is greater than 6 feet (2 meters) long

VMSE #1 must be set to the configuration (RS-232 or RS-422) that matches the Master

Figure 6-14. Using the VMSE in a Multidrop Arrangement

Multidrop Application Notes

•Any serial line longer than 6 feet (2 meters) must have a termination resistor across its receive terminals (RD or RX) at the end of each receive line.

•The serial port on the VMSE #2 screw terminals must be used since it is the only VMSE port that supports RS-422. The VMSE’s RJ-45 Serial port cannot be used since it is an RS-232 port only, and RS-232 does not support multidrop.

•The switch on the front of the VMSE #2 must be set to RS-422 position to enable RS-422 on the VMSE screw terminals. Also, the “Interface Type” configuration parameter must be set to RS-422 (no other setting is acceptable).

•Serial Line 1 may be RS-232 or RS-422 as long as both Master and VMSE #1 are configured accordingly.

•For Serial Line 2, which must be an RS-422 line, match the specifications and basic wiring scheme for User-Built Cable #4. All multidrop connections must be made at the nodes inside the connectors (thus, each connector terminal would have two wires attached), in a parallel “daisy-chain” style. No line stubs or intermediate terminal blocks are permitted.

•Each serial cable’s shield must be grounded at one end of the cable only.

•The VMSE can be the only device connected to the master on Serial Line 1 shown in Figure 6-14 above.

GFK-1852

Chapter 6 Serial Line Interfaces

6-9

GFK-1852 specifications

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