Black Box 422 User Manual
Page 16
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Chapter 3: Installation and Configuration
3.4.4 Echo
The RS-485 “Echo” is the result of connecting the receiver inputs to the
transmitter outputs. Each time a character is transmitted, it is also received.
This can be beneficial if the software can handle echoing (that is, using received
characters to throttle the transmitter), but it can also confuse the system if the
software cannot support echoing.
transmitter outputs. Each time a character is transmitted, it is also received.
This can be beneficial if the software can handle echoing (that is, using received
characters to throttle the transmitter), but it can also confuse the system if the
software cannot support echoing.
Echo configuration is software selectable for half-duplex RS-485. By default,
ECHO is disabled, and this configuration can be set by placing a check next to
“Enable Echo” in the “RS-485 Advanced Configuration” field, as shown in Figure
3-4.
ECHO is disabled, and this configuration can be set by placing a check next to
“Enable Echo” in the “RS-485 Advanced Configuration” field, as shown in Figure
3-4.
Figure 3-4. Enable Echo.
3.4.5 Status LEDs
Status LEDs on the front of the converter indicate the following information:
• MODE (Red or Green) – Indicates the electrical interface selected
- Green indicates RS-232 mode
- Red indicates RS-422 or RS-485 mode
- Green indicates RS-232 mode
- Red indicates RS-422 or RS-485 mode
• DATA (Green) – Blinks to indicate data is being transmitted or received