Owner`s manual

8
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IMPORTANT: Before you proceed with cabling, you must know
whether the devices to which you will connect the Model 24H 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. To verify the interface requirements, please
refer to the Owner's Manual for your device.
Serial ports on the MOD 24-4C and MOD 24-4E 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)
Directio
n
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 DTR - Voltage When Model 24 Print Buffer Full