Connectors: Power And Serial Interface (P4) - Digi One EM Hardware Reference Manual

Connectors: Power and Serial Interface (P4)

The Digi One EM has a single 12-pin, serial interface port
(labeled P4) that supports EIA-232 (TTL levels only), data
rates up to 230 Kbps and full-modem control. The following
figure helps you locate pins, and the table helps you identify
which signal uses each pin.
Pin
1
2
3
4
5
6
7
8
9
10
11
12
Digi One EM Hardware Reference
Signal Name
+5VDC to
+9VDC (input
only)
GND
RxD
TxD
RTS
DTR
CTS
DCD
DSR
RST~
Reserved
Reserved
Description
Input power to Digi One EM
Reference Ground for input power
Receive Data (input)
Transmit Data (output)
Request To Send
Data Terminal Ready
Clear To Send
Data Carrier Detect
Data Set Ready
Reset
Not used
Not used
9