Technical description – Impulse 2403 User Manual
Page 11
Specifications
Sealevel Systems SeaPORT+4 Page
8
Technical Description
The SeaPORT+4 utilizes four USB UARTs. These chips feature programmable
baud rate, data format, 128 byte Dual Port TX Buffer, and 384 byte Dual Port
RX Buffer. The RS-232/422/485 transceiver supports data rates up to 921.6K
baud for RS-422/485 and 460.8K baud for RS-232.
Features
• Hot pluggable device that does not require opening the case
• No system resources are required (i.e. I/O ports or IRQ’s)
• LED status indicators for USB Enabled and port activity
Connector Pin Assignments
RS-422/485 (DB 9 Male)
Signal Name Pin
#
Mode
GND Ground
5
TX +
Transmit Data Positive
4
Output
TX-
Transmit Data Negative
3
Output
RTS+
Request To Send Positive
6
Output
RTS-
Request To Send Negative
7
Output
RX+
Receive Data Positive
1
Input
RX-
Receive Data Negative
2
Input
CTS+
Clear To Send Positive
9
Input
CTS-
Clear To Send Negative
8
Input
RS-232 (DB-9
Male)
Signal Name
Pin
# Mode
GND Ground
5
TX Transmit
Data
3
Output
RTS
Request To Send
7
Output
DTR
Data Terminal Ready
4
Output
RX Receive
Data
2 Input
CTS
Clear To Send
8
Input
DSR
Data Set Ready
6
Input
DCD
Data Carrier Detect
1
Input
RI Ring
Indicator
9
Input