Understanding the
Connecting a PC to the DXP
Connect the serial data port of the PC to either of the serial data ports that the DXP provides on the CPU
board. The system designates these modular jacks as RS-232 1 and RS-232 2.
The default data format of the RS-232 and RS-232 2 data ports is shown in the following chart.
Port Type
B a u d
Data
stop
Rate
Bits
Bits
Parity
RS-232 1
9600
8
1
N o n e
RS-232 2
300
7
2
N o n e
,
If you have used the two CPU-provided serial data ports for connecting other DXP features (such as the PC
Attendant Position and a serial data printer), you can add a communications card to the DXP and connect
the programming PC to a serial data port that the card provides. See your DXP
System Hardware
Instructions
(the Volume I binder) for complete installation details.
You can connect the PC remotely through a telephone line to the DXP using customer-supplied modems at
both the PC and the DXP common equipment. The Comdial DXMDM modem is a DXP proprietary
modem. With it, you can use either of the CPU board’s serial data ports for connection.
RS-232 2
RS-232 1
I
(Front View of Jacks)
RS-232 Modular Jacks
Pin 1 = Request To Send
Pin 2 = Clear To Send
Pin 3 = Receive Data
Pin 4 = Transmit Data
Pin 5 = Signal Ground
Pin 6 = Frame Ground
Connecting a PC to the Digital Communications System