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Chapter 2 – SSP Installation (XVME-956/400)
2-7
RS-232C Usage - COM A and COM B
Table 2-13 lists the connector pin assignments for the RS-232C port at J1.
The entries in this table will also apply to the serial port at J2, if it is config-
ured as an RS-232C port, in accordance with Tables 2-3 and 2-11.
Table 2-13
.
COM A and COM B Pin Assignments (RS-232C
Signal Name
Function
In/Out
Pin
DCD
DSR
RXD
RTS
TXD
CTS
DTR
RI
GND
EN
Data Carrier Detect
Data Set Ready
Receive Data
Request to Send
Transmit Data
Clear to Send
Data Terminal Ready
Ring Indicator
Signal Ground
(Test use only)
in
in
in
out
out
in
out
in
--
in
1
6
3
7
3
8
4
9
5
--
RS-485 Usage - J2 Full Duplex
Table 2-14 lists the connector pin assignments for the serial port COMB J2.
It is configured as full duplex RS-485 port, in accordance with Tables 2-3
and 2-11.
Table 2-14
.
COM B Pin Assignments Full Duplex (RS-485)
Signal Time
Function
In/Out
Pin
AUXOUT-
TXD+
TXD-
GND
RXD-
RXD+
AUXIN-
AUXIN+
----
Handshake output, high
Handshake output, low
Transmit data, high
Transmit data, low
Ground
Receive data, low
Receive data, high
Handshake input, low
Handshake input, high
Not used
out
out
out
out
--
in
in
in
in
--
1
6
2
7
3
8
4
9
5
--
The signal lines shown in Table 2-14, provide for a full duplex operation
with handshaking. RS-485 is a differential interface, which provides for
greater immunity against noise and interference. This interface will drive
cable lengths up to 4000 feet at 57.6K bps. Terminators (120 ohms) are pro-
vided for the RS-485 input signals RXD and AUXIN. These terminators are
installed by shorting W16 and W17 (refer to Tables 2-11 and 2-12).
The handshake signals usually present on an RS-232C interface (RI, DSR,
DCD, CTS, RTS, and DTR) are not fully supported on the RS-485 interface.
Summary of Contents for XVME-976
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