Serial Ports 473
Serial Ports
Both serial ports provided are shipped in the RS-232C wiring configuration. To change either port to
an RS-422 configuration requires changing a jumper setting on the Serial Isolation Board located
inside the control on the back panel. Simply locate the appropriate jumper for the desired port at the
bottom of the board and move the jumper from the RS-232C position to the RS-422 position, which is
clearly marked on the board.
Warning! Configure the port for RS-422 Operation before connecting RS-422 compatible devises.
The serial ports in the control are specifically designed to operate with a standard nine pin serial port
connector. Specifications for these ports are as follows:
Channel Type Optically Isolated RS-232C or RS-422.
Information Code ASCII (American Standard Code for Information Interchange).
Baud Rate User selectable up to 115.2K baud.
Number of Start Bits 1
Number or Stop Bits 1
Word Length User selectable 7 or 8 bits.
Parity User selectable None, Even or Odd.
Data Synchronization XON (Control-Q) / XOFF (Control-S).
Time Out User selectable in one-second increments.
Transmit Delay User selectable in one one/hundredths of a second increments.
Rear Panel Connector IBM-PC/AT compatible 9-pin D-type female.
Control RS-232C DB-9 Pinout
Pin Signal Name Description
1 Shield Chassis Ground
2 TxD Transmit Data to External Device
3 RxD Receive data from External Device
4 No Connection
5 Common Ground
6 No Connection
7 No Connection
8 No Connection
9 No Connection
RS-232C Connections to Host PC with 9-pin D-type connector
Host PC Control
Signal Name DB-9 Pin Signal Name DB-9 Pin
Shield 1 Shield 1
RxD 2 TxD 2
TxD 3 RxD 3
Common 5 Common 5
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