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INNLINE IP Installation guide
Chapter 1: Installation
13
Device interface serial ports
InnLine IP comes standard with six physical RS-232 serial communication ports:
•
COM1
is a DB-9M connector that is part of the systems mother board, and may
be used for miscellaneous serial interfaces.
•
COM2
is a DB-9M connector that is part of the systems mother board, and may
be used for miscellaneous serial interfaces.
The following table shows the standard RS-232C serial interface port signals and
connector pin-outs for the InnLine IP system.
Signal Name
DB-9 DTE DB-25 DTE
DCD
Data Carrier Detect
1
8
RXD*
Receive Data
2
3
TXD*
Transmit Data
3
2
DTR
Data Terminal Ready
4
20
GND*
Signal Ground
5
7
DSR
Data Set Ready
6
6
RTS
Request to Send
7
4
CTS
Clear to Send
8
5
RI
Ring Indicator
9
22
* These three signals are of primary interest to the system.
When interfacing the InnLine IP system with external devices, the only required
signals are TXD, RXD and GND.
The external device, however, may require that other pins be connected.
These systems may
use what is called “hardware handshaking.” Contact the device
manufacturer for more information if you need help with handshaking.
It is often helpful to use a RS232 MINI-TESTER to check whether an interface cable is
properly wired.
A properly wired cable will show a low voltage (typically a red light) for
both TXD
and RXD
when no data is being transmitted, and a flickering high voltage (typically
a flickering green light) for either TXD or RXD when data is being transmitted. If
there is no voltage (no light) for either TXD or RXD, first check that the signal
ground (GND) is connected through both connectors properly. If either TXD or RXD
is low, but the other has no voltage, you may need to reverse the wiring for TXD and
RXD on a connector, because there is a conflict.
If problems persist, be careful to check connectors for loose pins and sockets.
Soldering connections may increase their durability. If a problem remains after
troubleshooting, contact Connected Guests for.
Most Device interfaces are preloaded before your system is shipped. To adjust
communication settings, such as baud rate, parity, data bits, or stop bits, click the
Do
button in the InnLine IP main screen and then select
Configure System
. In the next
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