19
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
