Connecting A 9-Way Socket To The Sdm-Sio1A For Rs-232 Devices - Campbell SDM-SIO1A Instruction Manual

SDM-SIO1A Serial Input/Output Module

6.2.1.6 Connecting a 9-Way Socket to the SDM-SIO1A for RS-232 Devices

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This configuration may be used if the device is fitted with a standard 9-way D
connector as was commonly fitted to PCs for their RS-232 port. You need to
check whether the device is configured as a DTE or DCE device and whether it
has a male or female connector before making up this cable.
In RS-232 mode, the main use of the CTS/RD– and RTS/TD+ lines is as
•
RTS/CTS hardware handshaking lines. CTS/RD– should be connected to
the remote equipment's RTS, and RTS/TD+ to its CTS line.
• The CTS/RD– (CTS) and RTS/TD+ (RTS) lines can also be used to
trigger external circuitry when not being used in handshaking mode. Note
that when using CTS/RD– and RT/TD+ lines as input and output, the
voltage levels are ±5V, NOT 0 and 5V.
CTS/RD– and RTS/TD+ cannot be used as separate input and output when
•
in RS-485 mode.
Pin 7
Pin 3
Pin 2
Pin 8