External Connectors and Switches
Original instructions
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RS-232 Serial Ports
The ASCII module has two RS-232 serial ports which it uses to communicate with serial devices.
The following are the pinout connections for the two serial ports:
Pin
Signal Name
Description
1
DCD
Carrier Detect
2
RXD
Receive Data
3
TXD
Transmit Data
4
N/A
Not Connected
5
GND
Signal Ground
6
N/A
Not Connected
7
RTS
Request to Send
8
N/A
Not Connected
9
N/A
Not Connected
Shield
N/A
Chassis Ground
Programming Port
Port 1 can also be used as the programming port (port 0). Programming mode is entered by holding down the Reset button for more then 4 sec. In programming mode, the serial port is set to a standard terminal communications configuration.
The port uses the following parameters in programming mode:
Parameter
Value
Baud rate
9600
Data bits
8
Stop bits
1
Parity bit
None (disabled)
Keyboard Mode
ON (character echo)
XON/XOFF
ON
The port configuration has been set this way so that it is a known configuration; it may or may not be the same configuration that is used when the module is running.
Minimum Cable Layout
The minimum required cable layout to connect the ESI module either to an external device or a programming terminal (PC) is shown in the following illustration:
Reset Push Button
A recessed push button is located on the front of the module. This Reset button has two functions: