Sc32A Pin Description; Dte Pin Configuration - Campbell CR510 Operator's Manual

SECTION 6. 9-PIN SERIAL INPUT/OUTPUT
TABLE 6.7-1. SC32A Pin Description
PIN = Pin number
O = Signal Out of the SC32A to a peripheral
I = Signal Into the SC32A from peripheral
25-PIN FEMALE PORT:
PIN # I/O
1
2 I
3 O
4 I
5 O
6 O
7
8 O
20 I
9-PIN MALE PORT:
PIN #
1
2
3
4
5
6
9
NOTE: The SC32A has a jumper, which
when used, passes data only when the ME
line is high and the SDE line is low. The
function of the jumper is to block data sent
to SDs from being received by a
computer/terminal used to initiate data
transfer. Synchronous data will appear as
garbage characters on a computer/terminal.
6.7.2 SC932 INTERFACE TO MODEMS
Most modems have an RS232 port configured
as DCE. For connection to DCE devices such
as modems and some computers, the SC932
9-pin to RS232 DCE Interface should be used.
6.7.3 COMPUTER/TERMINAL REQUIREMENTS
Computer/terminal peripherals are usually
configured as Data Terminal Equipment (DTE).
Pins 4 and 20 are used as handshake lines,
which are set high when the serial port is
enabled. Power for the SC32A RS232 section
is taken from these pins. For equipment
configured as DTE (see Table 6.7-2) a direct
ribbon cable connects the computer/terminal to
the SC32A. Clear to Send (CTS) pin 5, Data
Set Ready (DSR) pin 6, and Data Carrier Detect
(DCD) pin 8 are held high by the SC32A (when
the RS232 section is powered) which should
6-6
ABBREVIATION
GROUND
TX
RX
RTS (POWER)
CTS
DSR
GROUND
DCD
DTR (POWER)
ABBREVIATION
+5V INPUT
GROUND
RING
RX
ME
SDE
TX
satisfy hardware handshake requirements of
the computer/terminal.
Table 6.7-2 lists the most common RS232
configuration for Data Terminal Equipment.
TABLE 6.7-2. DTE Pin Configuration
PIN = 25-pin connector number
ABR = Abbreviation for the function name
O = Signal Out of terminal to another device
I = Signal Into terminal from another device
PIN ABR I/O FUNCTION
2 TD O Transmitted Data: Data
is transmitted from the
terminal on this line.
3 RD I Received Data: Data is
received by the terminal
on this line.
4 RTS O Request to Send: The
terminal raises this line
to ask a receiving device
if the terminal can
transmit data.
5 CTS I Clear to Send: The
receiving device raises
this line to let the
terminal know that the
receiving device is ready
to accept data.
20 DTR O Data Terminal Ready:
The terminal raises this
line to tell the modem to
connect itself to the
telephone line.
6 DSR I Data Set Ready: The
modem raises this line to
tell the terminal that the
modem is connected to
the phone line.
8 DCD I Data Carrier Detect: The
modem raises this line to
tell the terminal that the
modem is receiving a
valid carrier signal from
the phone line.
22 RI I Ring Indicator: The
modem raises this line to
tell the terminal that the
phone is ringing.
7 SG Signal Ground: Voltages
are measured relative to
this point.