Microcom 400 - Manual (Page 23)

400 Operators Manual 15
CHAPTER 3: COMMUNICATIONS
The model 400 can be interfaced to PC's, mini-computers, main frames, and other special
purpose machines. It is capable of serial RS-232 or optional parallel communication. The
following sections explain the communication interfaces.
Out of the box, unless otherwise requested, the Microcom 400 communicates using serial RS-
232 at 9600 baud, 8 data bits, 1 stop bit and no parity with both hardware and software
handshaking. This configuration may be changed as shown in Appendix E.
3.1 CABLE PINOUT
Table 2 shows the signals of the 400's 9-pin RS-232 serial port. Out of the box, unless
otherwise requested, the Microcom 400 communicates serially at 9600 baud, 8 data bits, 1
stop bit and no parity with both hardware and software handshaking. This configuration may
be changed through software commands as explained in the programming section of this
manual. Table 3 shows the optional parallel port configuration.
If XON/XOFF hand shaking is used, the only signals the 400 requires are RXD, TXD, and
GND. If hardware CTS/RTS hand shaking is used, a RTS signal is provided. XON/XOFF may
be disabled through the software dip switch #1 (see chapter 5). The other signals are offered
in the event the host computer requires them.
Serial Port Configuration
25 TO 9 PIN 9 TO 9 PIN
State 400 Direction PC
HI 1 DCD --->---- DCD 8
X 2 TXD --->---- RXD 3
X 3 RXD ---<---- TXD 2
HI 4 DSR ---<---- DTR 20
LO 5 GND --<->--- GND 7
HI 6 DTR --->---- DSR 6
DC 7 CTS ---<---- RTS 4
X 8 RTS --->---- CTS 5
DC 9 ----NOT USED----
DE-9 DB-25
DC = Do Not Care
X = Indeterminate
State 400 Direction PC
HI 1 DCD --->---- DCD 1
X 2 TXD --->---- RXD 2
X 3 RXD ---<---- TXD 3
HI 4 DSR ---<---- DTR 4
LO 5 GND --<->--- GND 5
HI 6 DTR --->---- DSR 6
DC 7 CTS ---<---- RTS 7
X 8 RTS --->---- CTS 8
9 ----NOT USED---- 9
DE-9 DE-9
DC = Do Not Care
X = Indeterminate
Table 2