Impulse 1104 - Manual (Page 11)

Technical Description
Sealevel Systems DIN485+ Page 9
Technical Description
The Sealevel Systems DIN485+ converts an existing RS-232 serial port into a DIN rail mountable, field selectable
RS-422/485 port for industrial automation and control applications.
Connector Pin Assignments
Power/RS-232 Pin Assignments (6 Position Screw Terminal)
Signal Name Pin # Mode
TD Transmit Data 1 Input
RD Receive Data 2 Output
RT Request to Send 3 Input
+V +DC Supply Input 4 Input
-DC Supply Input 5 Input
Shield 6 Input
Technical Note: The modem control signals are biased in the following fashion when using Sealevel’s’ CA-186
cable: RTS and CTS are connected, DTR is connected to DCD and DSR, and RI is tied inactive.
RS-422/485 Pin Assignments (6 Position Screw Terminal)
Signal Name Pin # Mode
RDB R+ Receive Data Positive 7 Input
RDA R- Receive Data Negative 8 Input
TDB T+ Transmit Data Positive 9 Output
TDA T- Transmit Data Negative 10 Output
GND Ground 11
SHIELD Shield 12