Wire Rs-232 Connections - DATEREMOTE CDS-9020 Manual

3 Wire RS-232 Connection
When using a 3 wire RS-232 connection, it requires you to put a jumper on JP1, RTS to CTS and add AT&D0
to the Modem String (Option: K.Modem Init) if JP1 is not shorted together your DTE device will not
communicate.
With the CDS-9020 you do need to short together DTR and DSR the AT&D0 does the same thing for you. If
you feel you need to, it will not affect your data. Shorting together JP2 DTR to DSR the current goes up about
7ma more when waiting for a call. In applications where the current draw is important, do not use JP2, use the
AT&D0 command.
Note: When plugging in the programming cable while JP-1 and JP-2 are shorted together, this will confuse the
DTE device. It is best you remove these jumpers when you are doing a local connection with programming
cable.
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