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B-6
Computer Group Literature Center Web Site
Serial Interconnections
B
EIA-530 Connections
The EIA-530 interface complements the EIA-232-D interface in function.
The EIA-530 standard defines the mechanical aspects of this interface,
which is used for transmission of serial binary data, both synchronous and
asynchronous. It is adaptable to balanced (double-ended) as well as
unbalanced (single-ended) signaling and offers the possibility of higher
data rates than EIA-232-D with the same DB-25 connector.
Table B-4
lists the EIA-530 interconnections that are available at
MVME761 serial ports 3 and 4 (J7
and J8 on the board surface) when those
ports are configured via serial interface modules as EIA-530 DCE or DTE
ports.
Table B-4. MVME761 EIA-530 Interconnect Signals
Pin
Number
Signal
Mnemonic
Signal Name and Description
1
Not used.
2
TxD_A
Transmit Data (A). Data to be transmitted; output from DTE to DCE.
3
RxD_A
Receive Data (A). Data which is demodulated from the receive line; input
from DCE to DTE.
4
RTS_A
Request to Send (A). Output from DTE to DCE when required to transmit a
message.
5
CTS_A
Clear to Send (A). Input to DTE from DCE to indicate that message
transmission can begin.
6
DSR_A
Data Set Ready (A). Input to DTE from DCE to indicate that the DCE is
ready to send or receive data. In DCE configuration, always true.
7
SG
Signal Ground. Common return line for all signals.
8
DCD_A
Data Carrier Detect (A). Receive line signal detector output from DCE to
DTE to indicate that valid data is being transferred to the DTE on the RxD
line.
9
RxC_B
Receive Signal Element Timing—DCE (B). Control signal that clocks input
data.
10
DCD_B
Data Carrier Detect (B). Receive line signal detector output from DCE to
DTE to indicate that valid data is being transferred to the DTE on the RxD
line.
11
TxCO_B
Transmit Signal Element Timing—DTE (B). Control signal that clocks
output data.