TANDBERG D14128.02 Connecting to the codec, cont, Hardware & Cabling RS-232, COM port RS-232

Codec C90

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Connecting to the codec, cont...

System Integrator Guide

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Hardware & Cabling (RS-232)

The pin outs for the RS-232 are defined in the tables to the right. Observe that the DTE (Data Terminal Equipment), could be a PC or any other device capable of serial communication.

Cable. A straight-through cable should be used between the TANDBERG RS-232 port and the DTE. The lower table shows the recommended cable-wiring scheme when connecting the TANDBERG Codec C90 to a PC through RS-232.

DTR and RTS are ignored. DSR, CD, and CTS are always asserted, while RI is not used.

Troubleshooting (RS-232)

If communication cannot be established between the PC/terminal and the TANDBERG Codec data port, the following should be checked:

1.Verify that the serial cable is a straight-through 9-pin to 9-pin cable.

2.Confirm that the configuration of the PC/terminal’s serial RS-232 port is identical to the configuration of the TANDBERG RS-232 port.

3.Verify that the PC/terminal’s serial RS-232 port is working properly by connecting it back-to-back to another PC/terminal and send characters in both directions.

COM port (RS-232)

Pin	Signal name	Direction
1	Carrier detect, CD	From DCE
2	Receive data, RXD	From DCE
3	Transmit data, TXD	To DCE
4	Data terminal ready, DTR	From DCE
5	Signal GND
6	Data set ready, DSR	From DCE
7	Ready to send, RTS	To DCE
8	Clear to send, CTS	From DCE
9	Ring indicator, RI	From DCE

Cable wiring (RS-232) TANDBERG DCE <-> PC

TANDBERG DCE 9 pin	Direction	PC DTE, 9 pin
1 CD	—>	1 CD
2 RD	—>	2 RD
3 TD	<—	3 TD
4 DTR	<—	4 DTR
5 GND	<—>	5 GND
6 DSR	—>	6 DSR
7 RTS	<—	7 RTS
8 CTS	—>	8 CTS
9 RI	—>	9 RI

D14128.02—NOVEMBER 2008 36