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Chapter 3
Serial B Interface (J3A/B)
Table 3-14. Serial B Interface Pin/Signal Descriptions (J3A/B)
Pin # Pin #
DB9
A1
1
(COM3)
A2
6
A3
2
A4
7
A5
3
A6
8
A7
4
A8
9
A9
5
A10
NC
B11
1
(COM4)
B12
6
B13
2
B14
7
B15
3
ReadyBoard 700
Signal
Description
DCD3* Data Carrier Detect 3 – Indicates external serial communications device
is detecting a carrier signal (i.e., a communication channel is currently
open). In direct connect environments, this input will be driven by
DTR3 as part of the DTR/DSR handshake.
DSR3*
Data Set Ready 3 – Indicates external serial communications device is
powered, initialized, and ready. Used as hardware handshake with
DTR3 for overall readiness to communicate.
RXD3
Receive Data 3 – Serial port 3 receive data in.
RX3-
RX3- – If in RS485 or RS422 mode, this pin is Receive Data 3 -.
RTS3*
Request To Send 3 – Indicates Serial port 3 is ready to transmit data.
Used as hardware handshake with CTS3 for low level flow control.
TX3+
TX3+ – If in RS485 or RS422 mode, this pin is Transmit Data 3 +.
TXD3
Transmit Data 3 – Serial port 3 transmit data out.
TX3-
TX3- – If in RS485 or RS422 mode, this pin is Transmit Data 3 -.
CTS3*
Clear To Send 3 – Indicates external serial communications device is
ready to receive data. Used as hardware handshake with RTS3 for low
level flow control.
RX3+
RX3+ – If in RS485 or RS422 mode, this pin is Receive Data 3 +.
DTR3* Data Terminal Ready 3 – iIndicates Serial port 3 is powered, initialized,
and ready. Used as hardware handshake with DSR3 for overall
readiness to communicate.
RI3*
Ring Indicator 3 – Indicates external modem is detecting a ring
condition. Used by software to initiate operations to answer and open
the communications channel.
GND
Ground
NC
Not connected/Key
DCD4* Data Carrier Detect 4 – Indicates external serial communications device
is detecting a carrier signal (i.e., a communication channel is currently
open). In direct connect environments, this input will be driven by
DTR4 as part of the DTR/DSR handshake.
DSR4*
Data Set Ready 4 – Indicates external serial communications device is
powered, initialized, and ready. Used as hardware handshake with
DTR4 for overall readiness to communicate.
RXD4
Receive Data 4 – Serial port 4 receive data in.
RX4-
RX4- – If in RS485 or RS422 mode, this pin is Receive Data 4 -.
RTS4*
Request To Send 4 – Indicates Serial port 4 is ready to transmit data.
Used as hardware handshake with CTS4 for low level flow control.
TX4+
TX4+ – If in RS485 or RS422 mode, this pin is Transmit Data 4 +.
TXD4
Transmit Data 4 – Serial port 4 transmit data out.
TX4-
TX4- – If in RS485 or RS422 mode, this pin is Transmit Data 4 -.
Reference Manual
Hardware
41
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