Automating Serial Data Workflows: Advanced Scripting and Macros

The Industrial Need for Automation

In modern manufacturing and R&D, manual terminal entry is a bottleneck. Engineers often find themselves repeating the same "request-response" sequences hundreds of times a day to verify device stability. Whether you are calibrating an industrial weigh scale or testing a new firmware build for a medical sensor, manual input introduces human error and lacks the timing precision needed for stress testing. With scripting, you can turn a simple monitoring tool into a strong Automated Test Equipment (ATE) controller.

Significant Feature Highlight: The Internal Scripting Engine

Advanced Serial Port Monitor integrates a powerful scripting engine that goes beyond simple macros. Unlike basic "send-on-click" buttons, this engine supports logic-based execution. It allows developers to use simple logic to handle loops and conditional branching. The engine can intercept incoming data, analyze answers in real-time, and trigger a specific response only when certain criteria are met, allowing for fully autonomous "handshake" simulations.

Data requests generated by a script in the main window

Developing Your First Automation Script

To begin, one must define the "state machine" of the communication. For example, if a device requires an AT+START command and must return an OK before the next command is sent, a script can be written to wait for that specific string.

Selecting COM Port: Scripts can select the destination COM port number.
Init Communication Parameters: Then it initialized all communication parameters.
Sending Data Packet: After this, it sends the "AT+START" data packet to the device with the termination character.

INITPORT COM1
SET BAUD 9600
SET DATABITS 7
SET FLOW NONE
SET PARITY NONE
SET STOPBITS 1
SEND AT+START^M

Simplify Your Test Environments Configuration

Setting up a multi-device test bench usually involves setting up each COM port's parameters and initialization string one by one, which can be very time-consuming. Using Advanced Serial Port Monitor's scripting features, you can combine the setup of your test environments into a single, repeatable process. Instead of switching RTS/CTS lines or sending "wake-up" packets to each connected sensor by hand, a master setup script can set up all active ports with the correct parity, stop bits, and baud rates one at a time. Scripts are saved to files, and then the name of the script is used in the command line (-f script.txt) to start Advanced Serial Port Monitor, and the script will be executed automatically.

INITPORT COM3
SET BAUD 9600
SET DATABITS 7
SET FLOW NONE
SET PARITY NONE
SET STOPBITS 1
SET STAMPVIEW 1
SET CREATEFILEMODE 0
SET OUTPUTFILE com_log.txt

Advanced Use Case: Stress Testing and Buffer Validation

The common usage scenario for scripting is Buffer Stress Testing. By writing a loop that sends data packets and check an expected response, you can identify the exact point at which a peripheral device's buffer overflows or device stoped processing data.

INITPORT COM2
:REPEAT
SEND LASER=1^M
DELAY 2000
SEND ?C1^M
GOTO :REPEAT

Expert Tip: Use the scripting engine to log the "time-to-response". If a device starts responding slower after 5,000 packets, you've identified a memory leak or a processing bottleneck that manual testing would likely miss.

Handling Dynamic Responses and Data Extraction

Often, a data response main contain several variants inside a ASCII string. Using the scripting engine's string manipulation functions, you can wait for several strings in one command. For example, login/password authentication in the remote console.

INITPORT COM6
SET RETRY 3                        ;Try 3 times
:Again
SEND ^C                            ;Send an attention character
WAITMULT 'READY|Login:>|User:>' 3  ;Wait 3 seconds for response
IF 1,2,3 Logon                     ;Got prompt, continue with logon
IF TIMEOUT Again                   ;Try again if we timed out
IF FAIL, Done                      ;Give up after 10 tries
:Logon
SEND 'Name, password^M'        ;Send name and password
:Done
SEND 'Bye^M'

Security, Reliability, and Error Handling

Automated scripts must be resilient. Advanced Serial Port Monitor allows for "try-catch" style logic. If a port unexpectedly closes or a device stops responding, the script can trigger an alarm, log the failure timestamp, and attempt to re-establish the connection. This level of reliability is essential for long-term soak testing, where the software runs unattended for days.

Download ASPM With Scripts