Table of Contents
Advertisement
3.
I/O ports
3.1
RS-232C ports (serial port)
Two bi-directional half-duplex RS-232C ports are available.
Pins are arranged so that Port A is configured as a modem,
and Port B as a terminal.
The difference between the
modem and terminal configurations is that all lines on the
same pin number have reversed roles as regards input/output,
or, e.g., Pin No. 2 (Transmit Data) of Port A (modem) is for
data input while the same number pins of Port B (terminal)
is for data output.
Table 3.1 shows the pin assignments.
Connectors
AMP206584-l and DB-25P (cable side)
Before plugging in the connector, determine whether it is
to be connected to Port A or B taking into account the
following items.
{l)
Type of external device port (modem configuration or
terminal configuration)
(2)
Type of connecting cable (direct type for modem-to-
terminal connection or cross type for terminal-to-
terminal connection)
For example, if the cross type cable is used for connect-
ing a CRT display to the HDG-1111, the cable connector
should be plugged into the Port B.
- 5 -
Advertisement
Table of Contents
