User guide

Appendix A: Electrical Pin Descriptions
INSTALLATION AND USER GUIDE 33
ISA module: Serial Port
TheISAmodule’sserialportconnectorisconfiguredtolooklikeastandard9‐pin“DCE”serialport.In
comparison,atypicalPCcomputerwouldhavea9‐pin“DTE”serialport.Therefore,inmostapplicationsa
straightthroughserialcable(DB9‐Male‐to‐Female)isusedtoconnectthecontrolling
devicetothetransmitter.
Onthereceiveside,generallyanull‐modelcablewillberequired.However,checktheuser‐guideforyour
equipmentbeforeconnectinganycables.

Thefollowingfigureshowstheserial‐portpinoutfortheISAmodule.

Note:BoththetransmitterandreceiverusethesameISA
module.Therefore,youwilllikelyneedanull‐modem
orgender‐adaptercableatoneendortheother.

Figure5.VoyagerRS232DB9‐FemaleConnection

ThefollowingtabledescribestheISAmodule’sserial‐portpinout.Notethatthisportisdesignedasa“DCE”
device.Therefore,astraight‐
throughcablewouldbeusedwhenconnectingtoaPC(forexample,whichisa
“DTE”device).

Table16.RS232serial‐portpinout
Pin Signal
name
Direction
1 DCD DataCarrierDetect:outputfromISAmodule.
2 RX Receive‐data:outputfromISAmodule.
3 TX Transmit‐data:inputtoISAmodule.
4 DTR DataTerminalReady:inputtoISAmodule.
5 Ground Signalcommon(ground).
6 DSR DataSetReady:outputfromISAmodule.
7 RTS RequesttoSend:inputtoISAmodule.
8 CTS CleartoSend:outputfromISAmodule.
9 RI RingIndicator:outputfromISAmodule.



DB9-F
Serial Port