Owner`s manual

16
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  !
IMPORTANT: Before you proceed with cabling, you must know
whether the devices to which you will connect the Model 24 are DTE
(Data Terminal Equipment) or DCE (Data Communication Equipment).
The following devices are generally DTE: terminals, printers,
computers like the IBM PC. The following devices are DCE: modems
and some computers.
If your device transmits data on Pin 2 or receives data on Pin 3, it is
DTE. If your device receives data on Pin 2 and transmits data on Pin
3, it is DCE. However, to verify the interface requirements, please refer
to the Owner's Manual for your device.
Serial ports on the Model 24's MOD 4C and MOD 4E I/O modules have
DB-25 male DTE connectors. DTE ports use the following signals for
communication:
DTE PORT PIN/SIGNAL DEFINITION
Pin Signal
(EIA-232)
Direction Description
1 PGND --- Protective Ground
2 Tx Output Data Out
3 Rx Input Data In
4 RTS Output + Voltage When Model 24 Powers-up
5 CTS Input Model 24 Transmit Enabled When +12 Volts. Internally
Enabled If No Wire Connected.
7 SGND --- Signal Ground
20 DTR Output - Voltage When Model 24 Print Buffer Full