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RS-232 ↔ CURRENT LOOP INTERFACE CONVERTER
5.2 Switch SWC
Switch SWC controls the RS-232 Connector Configuration (DCE/DTE).
Note: “OPEN” indicates Off and “CLOSED” indicates On.
5.2.1 DCE
The CL050 default configuration is DCE. The 10-position DIP switch is set as
follows:
SW1 Not Used
SW2 OPEN = SW2 and SW3 are ALWAYS in opposite
positions
SW3 CLOSED = With SW2 OPEN, Data Out is on Pin 3
SW4 OPEN = SW4 and SW5 are ALWAYS in opposite
positions
SW5 CLOSED = With SW4 OPEN, Data In is on Pin 2
SW6 OPEN = Pin 4 (RTS) not connected
SW7 CLOSED = Ties Pin 5 (CTS) to Pin 20 (DTR)
SW8 OPEN = Removes High on Pin 20 (DTR). If
system does not use DTR, raise CTS by
CLOSING both SW7 and SW8
SW9 CLOSED = Place High on Pin 6 (DSR)
SW10 Not Used
5.2.2 DTE
When configuring the CL050 as a DTE, the 10-position DIP switch is set as follows:
SW1 Not Used
SW2 CLOSED = With SW3 OPEN, Data Out is on Pin 2
SW3 OPEN = SW2 and SW3 are ALWAYS in opposite
positions
SW4 CLOSED = With SW5 OPEN, Data In is on Pin 3
SW5 OPEN = SW4 and SW5 are ALWAYS in opposite
positions
SW6 CLOSED = Place High on Pin 4 (RTS)
SW7 OPEN = Pin 5 (CTS) not connected
SW8 CLOSED = Place High on Pin 20 (DTR)
SW9 OPEN = Pin 6 (DSR) not connected
SW10 Not Used
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