Command Communications ComSwitch 8500-t Informacje Techniczne Pobierz pdf (Strona 71)

17-Nov-2014 G2T Programmers Guide Rev-A

8.1.2. Serial

The C3-001 offers a standard DB-9 serial port with multi-serial

interfaces (RS-232C, RS-422A, and multi-drop RS-485). Additionally,

the CPU has a USB 2.0 (Type-A) interface that may be used for

remote control.

8.1.2.1. DB-9 Connector

8.1.2.1.1. Changing the Serial Mode

The C3-001 CPU is delivered in the default state using the RS-232C

control protocol. RS-485 and RS-422A are also available. The serial

mode cannot be changed through the front panel. To change

the serial control mode, use the GET?/SET value 86 over one of the

remote interfaces. See Section 5.2.3 for more details. The current

serial mode is identified by the MODE LED on the CPU. See Section

8.4 for identification.

8.1.2.1.2. Setting the RS-485 Address

When in the RS-485 control mode, the unit needs to have an

address. The factory default address is 0. The Network ID is used as

the RS-485 address. Refer to Section 5.2.3 for more details.

When addressing a system over RS-485, all commands must be

preceded by the systems RS-485 address.

8.1.2.1.3. Serial Port Pin Assignment

The DB-9 serial port has the following pin assignment:

Number

RS-232C

Mode

RS-422A

Mode

RS-485

Mode

Not Used

Transmit Data – (out)

Not Used

Transmit Data (out)

Transmit Data + (out)

Not Used

Receive Data (in)

Receive Data + (in)

Data +

Not Used

Receive Data – (in)

Data -

Ground

Not Used

Clear To Send -

Not Used

Clear To Send

Clear To Send +

Not Used

Ready To Send

Ready To Send +

Not Used

Ready To Send -

Not Used

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