This line must be made active by the host in
order for the controller to send data unless
handshake lines are inactive (see switch
settings, Section 5.8).
Since the controller is a respond only device
and does not initiate correspondence, the
controller assumes that the host is ready to
receive if the clear to send line is active,
and does not monitor this line.
This line provides a common signal connection
for the RS232C environment. It is also used
as a ground reference for the power supplied
by user for isolated configurations.
Return line for Data Terminal Ready signal
(PIN 20) used with RS422 with handshake only.
User must supply +12 VDC on this PIN if using
RS232 isolated or +5 VDC if using RS422
isolated configuration. No connection other-
User must supply-12 VDC on this PIN if using
RS232C isolated configuration. No connection
Return line for Clear to Send signal (PIN 5)
used with RS422 with handshake only.
for Send Data signal (PIN 2)
used with RS422. Also 20 mA current loop
return line for transmit loop.
Return line for Request to Send signal
(PIN 5) used only with RS422 with handshake.
Return line for Receive Data signal (PIN 3)
used with RS422 or 20 mA current loop on
receive loop. Internally tied to Signal
Ground (PIN 7) for RS232C operations.
When handshake lines are used, this line is
always active telling the host to send data
at any time. This line is in an undetermined
state when handshake is not used.
Return line used for Data Set Ready
(PIN 6) used with RS422 with handshake only.
ECLIPSE INSTRUMENTATION DIVISION