
System Installation
44 025-9035AA
Confirming the Serial Port Pinout
The Digi One SP module is capable of supporting three different serial port standards.
They are EIA-232 (same as RS-232), EIA-422/485 Full-Duplex, and EIA-485 Half
Duplex. Which type of serial port is being supported is set using a small, red, 4-position
DIP switch on the bottom of the module near the end with the serial port D-connector. In
this application, the switch will always be set to support an EIA-232 serial port.
Figure 12: Digi One™ SP Serial Port Switch set to EIA-232
When the switch is configured as shown in Figure 12 (that is switch 1 up and switches 2,
3, and 4 down), the module is set for EIA-232 and the D-connector will have the pinout
shown in Table 1.
Table 1: Pinout of the Digi One™ SP configured for EIA 232
Warning! It is important that the switch be set correctly since the
functions of the various pins change depending on how it is
set. Actual damage to equipment can occur if the serial cable
is plugged in while the switch is set to the wrong serial port
type.
STOP
DB-9 Pin EIA-232 Signal
1DCD
2RXD
3TXD
4DTR
5 GND
6DSR
7RTS
8CTS
9RI
Shell GND
Up = On
Down = Off
1234
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