User's Manual

SERIAL COMMUNICATIONS

4.4 DIP SWITCHES

There are eight DIP switches inside the C827 enclosure that control the bus address of the

device, the speed of the bus communications and whether RS232 or RS485/SUBNET16

communications are active. To manually set these parameters you must open the reader/

writer to expose the DIP switches.

To expose the DIP switches, disconnect the reader/writer from power and remove the two

captive screws holding the cover to connector backplate. The DIP switches are located at the

bottom of the device.

All DIP switches are set to the OFF position at the factory.

While all switches are in the OFF position, changes made through the configuration program

will be effective. Changing any of the switches to the ON position will override settings made

through the configuration program for those variables. Some RS232 variables (baud rate) not

set by the DIP switches can still be modified by the configuration program. See Chapter 5,

page 26, for more information on the configuration program and serial variables.

Figure 4-1 shows the DIP switches and the OFF/ON positions.

The C827 is shipped with all the switches set to the OFF position.

Figure 4-1: DIP switch positions

Table 4-3 describes the function of each switch.

Table 4-3: DIP switch functions

Switch

Number

Description

1 Data Legth, OFF = 8bits (default), ON = 7bits

2, 3 Parity:

2 = OFF 3 = OFF None (default)

2 = OFF 3 = ON Even

2 = ON 3 = OFF Odd

2 = ON 3 = ON Reserved

4 Stop bit, OFF = 1bit (default), ON = 2bits

5 Xon/Xoff, OFF = Xoff (default), ON = Xon

6 Serial port type, OFF = not isolated (default), ON = isolated

7 Reserved (OFF) (ON only on special version SH4352*)

8 Reserved (OFF)

9 Reserved (OFF)

10 Reserved (OFF) (ON only on special version SH4352*)

All switches OFF = Options configured through the configuration menu.

Any switch ON = Options set by switch settings.

* NOTE: The C827 special version SH4352 is only a custom product with the reader block. This

product does not include the terminal block and the antenna head. This product has been

developed exclusively to work with the HMS827 antenna head with 2 connectors version.