Moxa Technologies 1200, 1600, 1400 user manual Connecting to a Serial Device

UPort 1200/1400/1600 Series User’s Manual Driver Installation

If the power is properly supplied, the Active LED will glow a solid green.

Buzzer (UPort 1400 and 1600 only)

UPort will sound the buzzer twice when the power is turned on. You will also hear the buzzer when using the Locate function on the driver property page.

Connecting to a Serial Device

Connect the serial cable between UPort 1200/1400/1600 and the serial device. UPort 1200/1400/1600’s serial ports use the RS-232 or RS-422/485 interface to transmit data. The port uses a standard male DB9 pin assignment.

LED Indicators

UPort 1250/1250I

There are five LEDs to indicate status for each port, listed under P1 and P2.

LED Name	LED Color	LED Function
Active	Red	Power is on
	Off	Power is off, or power error condition exists
RS-232	Red	Port is configured for RS-232 operation
RS-422	Red	Port is configured for RS-422 operation
4W RS-485	Red	Port is configured for 4-wire RS-485 operation
2W RS-485	Red	Port is configured for 2-wire RS-485 operation
TxD/RxD	Orange	Port is receiving data from attached device
	Green	Port is transmitting data to attached device
	Off	No data is being transmitted or received
UPort 1400/1600
LED Name	LED Color	LED Function
Active	Green	Power is on
	Off	Power is off, or power error condition exists
Tx/Rx	Orange	Port is receiving data from attached device
	Green	Port is transmitting data to attached device
	Off	No data is being transmitted or received

Adjustable Pull High/low Resistors for the RS-485 Port

In some critical environments, you may need to add termination resistors to prevent the reflection of serial signals. When using termination resistors, it is important to set the pull high/low resistors correctly so that the electrical signal is not corrupted. The UPort uses DIP switches to set the pull high/low resistor values for each serial port.

To set the pull high/low resistors to 150 KΩ, make sure both of the assigned DIP switches are in the OFF position. This is the default setting.

To set the pull high/low resistors to 1 KΩ, make sure both of the assigned DIP switches are in the ON position.

ATTENTION

Do not use the 1 KΩ setting on the UPort when using the RS-232 interface. Doing so will degrade the RS-232 signals and shorten the maximum allowed communication distance.

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