Installation
27
Connecting to a DTE Device
A DTE device is a terminal, serial printer, another computer's serial port, etc.
To connect the C/CON concentrator (which is also a DTE device) to another
DTE device, you need a null modem cable or adapter.
DB-25 Equipped Concentrators
Software Handshaking (XON/XOFF)
In most cases, serial terminals and printers need only a "three-wire" connection
to the concentrator. Digi device driver software supports XON/XOFF (software)
handshaking, so the only signal lines necessary are Transmitted Data (TxD), Re-
ceived Data (RxD) and Signal Ground (SG). It may be necessary to disable
DCD (Data Carrier Detect) sensing through a software command--see the Digi
device driver manual for instructions. Cables must be shielded to remain in
compliance with FCC certification requirements, and the shield should be
connected to Chassis Ground (GND) at both ends of the cable run.
A simple cable for connecting a terminal or a printer to a DB-25 equipped
concentrator is shown in Figure 19.
Figure 19
Simple Terminal/Printer Cable (DB-25)
DB-25 Female
DB-25 Male
Pin
Pin
GND
TxD
RxD
RTS
CTS
DSR
SG
DCD
DTR
RI
GND
TxD
RxD
RTS
CTS
DSR
SG
DCD
DTR
RI
Signal
Shell
2
3
4
5
6
7
8
20
22
1
2
3
4
5
6
7
8
20
22
Signal
(
Cable Shield)
Shielded cable must be used to remain in compliance with
Part 15 of FCC rules.
Summary :
Figure 19 Simple Terminal/Printer Cable (DB-25) DB-25 Female DB-25 Male Pin Pin GND TxD RxD RTS CTS DSR SG DCD DTR RI GND TxD RxD RTS CTS DSR SG DCD DTR RI Signal Shell 2 3 4 5 6 7 8 20 22 1 2 3 4 5 6 7 8 20 22 Signal ( Cable Shield) Shielded cable must be used to remain in compliance with Part 15 of FCC rules.
Tags :
cable,deice,db25,signal,software,dte,txd,serial,gnd,rxd,dcd,concentrator,data