Reliant Octel 200 and Octel 300 Message Servers PB6001401 User Manual

Page 135

Installation 4-17

Octel Overture 200/300 Serenade 3.0

PB60014–01

Table 4-4 DCE Pinouts for Cable Connections Between the RS-232C

Terminal and the Octel Overture 200/300

Pin

EIA/CKT

Signal Function

Protective ground

Transmit data (TX)

Receive data (RX)

Request to send (RTS)

Clear to send (CTS)

Signal ground

Receive-line signal detector (DCD)

Data terminal ready (DTR)

Figure 4-6 First and Second RS-232C Serial-Port Cable Pinouts

for Connection to Terminal Equipment (DTE)

НН

1 Protection Ground

2 TX

3 RX

4 RTS

5 CTS

7 Signal Ground

8 DCD

20 DTR

НН

Octel Overture
200/300

(DCE)

To Terminal (DTE)

For correct operation, DTR (pin 20) must be asserted TRUE by the terminal. RTS (pin 4) must be exerted
TRUE by the terminal when the terminal is able to accept data, or pin 4 must be left open.

If the terminal/teleprinter equipment has pins 1 and 7 connected together, intermittent problems with
the Octel Overture 200/300 might occur. Terminal/teleprinters requiring Data Set Ready (DSR) could
require that pins 6 and 8 be connected together, or pins 8 and 20 connected together at the terminal end of
the RS-232C cable. If you have a problem with or question about your terminal/teleprinter, call Octel
technical support.

Connections Between an External Modem and the Octel Overture
200/300

You can use an external modem if a dedicated modem connection is required or if a modem with a baud
rate different from the Octel Overture 200/300 internal modem is required. You can use a modem that
supports standard baud rates (300 to 9600 baud) connected to the system-terminal port. Table 4-5 lists the
pinouts for an external modem connection. Figure 4-7 is a diagram of external modem pinouts.