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COM128 Installation and Operation Manual Schneider Electric
4
3 CONFIGURATION
3.1 CONFIGURATION SWITCHES
These six switches are used to configure the COM128 for the
desired operation (see Figure 3.1.1). A switch is ON when it is
in the UP position. The following is a description of each mode
of operation. A list of switch settings for the different modes
follows each mode description. The configuration switches are
only read when control power is initally applied to the
COM128. To re-configure the COM128, the control power
must be removed and re-applied.
3.2 MODE DESCRIPTIONS
3.2.1 RS-485 FLOW CONTROL
FUNCTION
This mode is used to convert the RS-232 signals from either a
DTE or DCE device to RS-485 signals. The COM128 makes the
signal conversion and provides the timing control signals for
the RS-485 ports. No data buffering takes place. Timing can be
set for a fixed baud rate or the COM128 is able to do auto-
matic baud rate detection on the incoming RS-232 data. Either
the DTE or DCE port can be programmed. When the DTE port
of the COM128 is selected in automatic baud rate detection
mode, the input CD (Carrier Detect) signal from the DCE
device can be used to control the transmission of RS-232 data
from the COM128 to the DCE device.
For applications where a DTE device uses the RS-232 RTS
signal for flow control the COM128 can be programmed to use
the RTS signal to control the RS-485 ports.
SW2
SW1
SW3
SW4
SW5
SW6
OFF
ON
SWITCHES
1 2 3 4 5 6
NOTE
Setting the Configuration Switches to an
undefined value will cause the COM128 to
continually reset.
Mode Port Baud SW1 SW2 SW3 SW4 SW5 SW6
RS-485 Flow Control @ fixed Baud Rate DTE 1200 OFF OFF OFF OFF ON OFF
RS-485 Flow Control @ fixed Baud Rate DTE 2400 ON OFF OFF OFF ON OFF
RS-485 Flow Control @ fixed Baud Rate DTE 4800 OFF ON OFF OFF ON OFF
RS-485 Flow Control @ fixed Baud Rate DTE 9600 ON ON OFF OFF ON OFF
RS-485 Flow Control @ fixed Baud Rate DTE 19,200 OFF OFF ON OFF ON OFF
RS-485 Flow Control @ fixed Baud Rate DCE 1200 ON OFF ON OFF ON OFF
RS-485 Flow Control @ fixed Baud Rate DCE 2400 OFF ON ON OFF ON OFF
RS-485 Flow Control @ fixed Baud Rate DCE 4800 ON ON ON OFF ON OFF
RS-485 Flow Control @ fixed Baud Rate DCE 9600 OFF OFF OFF ON ON OFF
RS-485 Flow Control @ fixed Baud Rate DCE 19,200 ON OFF OFF ON ON OFF
RS-485 Flow Control with Auto Baud Rate Detect DCE NA OFF ON OFF ON ON OFF
RS-485 Flow Control with Auto Baud Rate Detect DTE NA ON ON OFF ON ON OFF
RS-485 Flow Control with Auto Baud Rate Detect and Carrier Detect Required DTE NA OFF OFF ON ON ON OFF
RS-485 Flow Control with Hardware RTS DCE NA ON OFF ON ON O N OFF
Figure 3.1.1 COM128 Configuration Switches