903-0628-00 Rev. 1
Model 903-HD User's Guide – FMB-X-2.5
Focal Technologies Corp.
Page 4-18
Figure 4-13: AIB RS-422 Interface Schematic
Full duplex communication runs transmit and receive on separate conductors, thus autosense is not required.
The AIB modules support full duplex transmission as either RS-422 or TTL data.
Connector pin designations for the WAGO connectors are given in the table below with default configuration
shaded.
Table 4-6: AIB-485 Pin Designations
Pin RS-485 Designation
RS-422 Designation
TTL Designation
1
TX+/RX+
RX+
TTL IN
2
TX-/RX-
RX-
N/C
3
N/C
TX+
TTL OUT
4
N/C (or ISOGND)
TX-
ISOGND
Switch settings for the various configurations are given in Table 4-7. When using the module in RS-422 or
TTL input configuration, the autosense mode (SW3, SW4) should be set for full-duplex operation. Autosense
baud rate settings (SW5) are ignored when the module is in full-duplex or simplex modes.
As shown in Table 4-6 and Table 4-7, ISOGND for RS-485 configuration can be made available on pin 4 of
the Wago connector by setting switch SW2 circuit #6 to “ON” (=1). This can be used as a ground reference
for external equipment. (The default setting for pin 4 is N/C.)
Summary of Contents for Focal 903
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Page 89: ...903 0628 00 Rev 1 Model 903 HD User s Guide FMB X 2 5 APPENDIX E BACKPLANE PIN CONFIGURATIONS ...
