SERIAL INTERFACE CONNECTOR SPECIFICATION
This 25-pin D-type connector with sockets (DB255=female) is used to
interface to RS-232-C standard signals. Signal names correspond to
those used in other places in this appendix, when possible.
WARNING: Pin on the R5232 connector other than these standard ones
described below may be connected to power or other non-R5232 standard
signals. When making up RS232 cables, connect only those pins actually
used for particular application. Avoid generic 25-connector "straight-
thru" cables.
SERIAL INTERFACE CONNECTOR PIN ASSIGNMENT (J6)
R5-232-C
NAME DIR STD NOTES
---- --- --- -------------------------------
FGND y Frame ground -- do not tie to signal ground
TXD O y Transmit data
RXD I y Receive data
RTS O y Request to send
CTS I y Clear to send
DSR I y Data set ready
GND y Signal ground -- do not tie to frame ground
CD I y Carrier detect
-5V n* 50 ma maximum *** WARNING -5V ***
AUDO O n* Audio output from left (channels 0, 3) port,
intended to send audio to the modem.
AUDI I n* Audio input to right (channels 1, 2) port,
intended to receive audio from the modem; this
input is mixed with the analog output of the
right (channels 1, 2). It is not digitized or
used by the computer in any way.
DTR O y Data terminal ready.
RI I y Ring Indicator (A500/A2000 only) shared with printer
"select" signal.
RESB* O n* Amiga system reset.
NOTES:
n*: See warning above
See part 1 of this appendix for pin numbers.
SERIAL INTERFACE CONNECTOR TIMING
Maximum operating frequency is 19.2 KHz. Refer to EIA standard
R5-232-C for operating and installation specifications.
A rate of 31.25 KHz will be supported through the use of a MIDI adapter.
Modem control signals (CTS, RTS, DTR, DSR, CD) are completely under
software control. The modem control lines have no hardware affect
on and are completely asynchronous to TXD and RXD.
- 304 Appendix E -
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