7700 MultiFrame Manual
7707DT RS-232/422/485 Fiber Data Transceiver
Page - 8
Revision
1.8
-RS422 OUT:
Negative RS-422 output. The RS-422 interface is usable while the associated channel is
configured for RS-422 use.
2.2.3. LTC
Connections
+LTC IN:
Positive LTC input connection.
-LTC IN:
Negative LTC input connection.
+LTC OUT:
Positive LTC output connection.
-LTC OUT :
Negative LTC output connection.
2.2.4. GPIO Connections (7707DT-GPIO Versions Only)
GPI1 thru GPI8:
General purpose inputs to the 7707DT-GPIO. See section 3.4 for electrical
characteristics, and section 2.3 for connection details.
GPO1 thru GPO8:
General purpose outputs from the 7707DT-GPIO. See section 3.5 for electrical
characteristics, and section 2.3 for connection details.
GPO COMMON:
This is the common connection for the GPO contact closures of the 7707DT-GPIO.
See section 2.3 for connection details.
Please note that the GPO Common Pin is on a separate connector.
2.3.
GENERAL PURPOSE INPUTS AND OUTPUTS
The 7707DT-GPIO provides the user with 8 General Purpose Inputs (GPI’s) and 8 General Purpose
Outputs (GPO’s). Figure 2-5 shows the input and output circuitry. Refer to sections 3.4 and 3.5 for
electrical specifications. The GPI input stage uses opto-isolators for isolation. The GPO output stage uses
dry contact relay closures. A typical application providing a contact closure or transistor connection to
ground would activate the GPI inputs.
