This section illustrates some examples of common
RS-232 cabling, showing wiring configurations for both DB25 and RJ45
connectors.
Note: Cable lengths must conform to limits in the RS-232 specification.
The high speed capability is provided for the purpose of connecting
high speed devices such as Terminal Adapters over short cable lengths.
(i.e. up to 2 meters).
Note: Under some operatring systems, the DSR signal must be asserted
before any data can be transmitted or received on a port. DSR is an
input in to the EasyIO. On current EasyIO models, DSR signal is not
physically present, and the driver reports DSR as being asserted. On
models with DSR signal present, you must either cable DSR through, or
use the appropriate driver parameter to 'artificially' report DSR as
always asserted.
Asynchronous
Modem
Software Handshaking (3 wire)
Hardware Handshaking (Wyse 60)
PC Serial Port to EasyIO Port
EasyIO Port to EasyIO Port Intermachine
Software Handshaking Printer
Hardware Handshaking Printer
Note:
If the terminal or printer does not use DTR (pin 20) to indicate a busy
condition, substitute the correct signal on the correct pin for DTR
(pin 20) on the printer end in the above diagrams. Some printers also
need either or both of the signals DSR and DCD to be held high to enable
the printer to receive data. This can be achieved by linking DCD and
DSR to another signal on the printer, such as DTR or RTS. Make sure
this signal is not used as the hardware handshaking signal.
Wyse-60 Attached Printer
