Specifications

Chapter 4 Hardware Reference
ReadyBox Users Guide 39
Pin # Signal Description
7
RTS3
TX3+
Request To Send 3 – Indicator to serial output port 3 is ready to transmit data.
Used as hardware handshake with CTS3 for low level flow control.
TX3+ – If in RS485 or RS422 mode, this pin is Transmit Data 3 +.
8
CTS3
RX3+
Clear To Send 3 – Indicator to serial port 3 that external serial communications
device is ready to receive data. Used as hardware handshake with RTS3 for
low level flow control.
RX3+ – If in RS485 or RS422 mode, this pin is Receive Data 3 +.
9 NC Not connected
Table 4-4. Serial 4 Port Connector Pin/Signal Descriptions
1 DCD4 Data Carrier Detect 4 – Indicator to serial port 1 that external modem is
detecting a carrier signal (i.e., a communication channel is currently open). In
direct connect environments, this input will be driven by DTR1 as part of the
DTR/DSR handshake.
2RX4
RX4-
Receive Data 4 – Serial port 4 receive data in
RX4- – If in RS485 or RS422 mode, this pin is Receive Data 4 -.
3TX4
TX4-
Transmit Data 4 – Serial port 4 transmit data out
TX4- – If in RS485 or RS422 mode, this pin is Transmit Data 4 -.
4 DTR4 Data Terminal Ready 4 – Serial port 1 indicator that port is powered,
initialized, and ready. Used as hardware handshake with DSR1 for overall
readiness to communicate.
5 GND Ground
6 DSR4 Data Set Ready 4 – Indicator to serial port 1 that external serial
communications device is powered, initialized, and ready. Used as hardware
handshake with DTR1 for overall readiness to communicate.
7RTS4
TX4+
Request To Send 4 – Indicator to serial output port 4 is ready to transmit data.
Used as hardware handshake with CTS4 for low level flow control.
TX4+ – If in RS485 or RS422 mode, this pin is Transmit Data 4 +.
8CTS4
RX4+
Clear To Send 4 – Indicator to serial port 4 that external serial communications
device is ready to receive data. Used as hardware handshake with RTS4 for
low level flow control.
RX4+ – If in RS485 or RS422 mode, this pin is Receive Data 4 +.
9 NC Not connected
Notes: The shaded area denotes power or ground. RS232 signals are listed first followed by
RS485/RS422 signals.