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8 1892 1335 - Orion Radio Modem Operating Instructions - v1.3 / Aug 2006
Serial Port
9-way D-type male connector - NOT a standard serial port
v Protocol (RS232, RS422 or RS485) is fixed by soldered links. See page 10.
Pin No RS232 RS422 RS485
1 SHDN Modem on/off input
If < 0.6V, Modem = OFF
If o/c (internal pull-up to +5V) Modem = ON
2 RXD Receive Data
output
OP Receive Data
inverting output
IO Inverting
input/output
3 TXD Transmit Data
input
IP Transmit Data input NC No function
4 TXB Secondary
Transmit Data
input
NC No function NC No function
5 0V
6 VSENSE External Battery Monitor input +50VDC max
7 RTS RTS input
IP Transmit Data
inverting input
NC No function
8 CTS CTS output OP Receive Data
output
IO Non-inverting
input/output
9 RXB Secondary
Receive Data
output
NC No function NC No function