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100

101

Serial (RS-232/422/485) 5.5

Communications 5-251

• 03: Read Holding Registers

• 06: Preset Single Register

• 16 (10 Hex): Preset Multiple Registers

• 23 (17 Hex): Read/Write 4X Registers

Each of the above functions acts on 4X or Holding registers. The RMC has these 4X registers

mapped as described in the following topic:

• RMC Register Map (Modbus/TCP)

Protocol-Specific Settings

The RMC Modbus/RTU implementation has one protocol-specific setting: the node address.

Enter this address in the Serial Module Options dialog box, as described in Configuring the

RMC SERIAL.

5.5.3.2 Using DF1 (Full- and Half-Duplex) with the RMC SERIAL

Note: Full- and half-duplex DF1 was added to the RMC SERIAL module in 20010627 firmware.

Modules with firmware dating prior to this do not support DF1.

The DF1 Protocol

Allen-Bradley’s DF1 Protocol and Command Set Reference Manual (pub. no. 1770-6.5.16) is the

authority on the DF1 full- and half-duplex protocols. This manual is available on Allen-Bradley’s

web site (http://www.ab.com). As of this writing, the following URL contains this document:

http://www.ab.com/manuals/cn/17706516.pdf. When this link is out-of-date, try searching for the

above publication number.

Full-duplex DF1 is used for peer-to-peer communication. Therefore, only two devices can

communicate with one another. Only RS-232 or RS-422 support full-duplex.

Half-duplex DF1 is used for master-slave communication with one or more slaves. When more

than two devices communicate with one another, 2-wire RS-485 is used. Otherwise, any line

driver can be used.

RMC Support for DF1

Both full- and half-duplex DF1 use the same application protocol, which consists of commands

and functions for the slave or peer to execute. The RMC supports the following DF1 functions:

• PLC5 Word Range Write (CMD=0x0F, FNC=0x00)

• PLC5 Word Range Read (CMD=0x0F, FNC=0x01)

• PLC5 Typed Write (CMD=0x0F, FNC=0x67)

• PLC5 Typed Read (CMD=0x0F, FNC=0x68)

• SLC Protected Typed Write with 2 Address Fields (CMD=0x0F, FNC=0xA9)

• SLC Protected Typed Read with 2 Address Fields (CMD=0x0F, FNC=0xA1)

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