Data Sheet

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 RS232 RS422 RS485
#1 No connection RTS- (output) No connection
#2 RX (input) RX- (input) RX- (input)
#3 TX (output) TX+ (output) TX+ (output)
#4 DTR (output) TX- (output) TX- (output)
#5 Ground Ground Ground
#6 DSR (input) RX+ (input) RX+ (input)
#7 RTS (output) RTS+ (output) No connection
#8 CTS (input) CTS+ (input) No connection
#9 No connection CTS- (input) No connection
The above pin assignment is the same we use on all our devices with the universal port (for
example, see the serial port of the DS1102 ).
You can also combine the RS232 Tibbit with #20 (9 terminal blocks).
LEDs
There are eight LEDs: ve red and three green. Red LEDs are connected to TX, RTS, DTR, FD/-HD,
and -232/422-485 lines. Green ones are for RX, CTS, and DSR. All LEDs are buered (with logic gates)
and light up for the LOW state of control lines.
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Tibbit Module