diff --git a/lib/modem.js b/lib/modem.js
index 3e7f364..61b81b7 100644
--- a/lib/modem.js
+++ b/lib/modem.js
@@ -2,7 +2,8 @@
 
 const INTERVAL_BEETWEN_SIGNAL_STRENGTH_MS = 60000;
 const MAX_LAST_DATA_AGE_MS = 3 * 60 * 1000;
-const REGEX_WAIT_FOR_OK_OR_ERROR = /\n(?:OK|ERROR)\r\n/;
+// const REGEX_WAIT_FOR_OK_OR_ERROR = /\n(?:OK|ERROR)\r\n/;
+const REGEX_WAIT_FOR_OK_OR_ERROR = /(?:OK|ERROR)\r/;
 
 const moment = require('moment');
 const SerialPort = require('serialport');
diff --git a/package-lock.json b/package-lock.json
index 7a3a5e0..270f0b2 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -80,6 +80,11 @@
       "resolved": "https://registry.npmjs.org/@serialport/parser-delimiter/-/parser-delimiter-2.0.2.tgz",
       "integrity": "sha512-zB02LahFfyZmJqak9l37vP/F1K+KCUxd1KQj35OhD1+0q/unMjVTZmsfkxFSM4gkaxP9j7+8USk+LQJ3V8U26Q=="
     },
+    "@serialport/parser-inter-byte-timeout": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/@serialport/parser-inter-byte-timeout/-/parser-inter-byte-timeout-1.1.0.tgz",
+      "integrity": "sha512-FHJGjRzgnNsMP2mzyfnbFBd0Kh6abyXX4e0zwVfN1zmeIPc05CjXSomuy9c8qH4EzaASHosNGjDpisw/aL+53g=="
+    },
     "@serialport/parser-readline": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/@serialport/parser-readline/-/parser-readline-2.0.2.tgz",
diff --git a/package.json b/package.json
index 3aa9dcc..f3d3704 100644
--- a/package.json
+++ b/package.json
@@ -27,6 +27,7 @@
   },
   "dependencies": {
     "@serialport/parser-delimiter": "^2.0.2",
+    "@serialport/parser-inter-byte-timeout": "^1.1.0",
     "@serialport/parser-readline": "^2.0.2",
     "@serialport/parser-regex": "^2.0.2",
     "express": "^4.17.1",
diff --git a/tools/parser-test.js b/tools/parser-test.js
new file mode 100644
index 0000000..f2e40f2
--- /dev/null
+++ b/tools/parser-test.js
@@ -0,0 +1,49 @@
+'use strict';
+
+/* eslint-disable no-console */
+
+const devicePath = '/dev/ttyUSB0';
+
+const moment = require('moment');
+const SerialPort = require('serialport');
+
+console.log(Buffer.from('OK'));
+console.log(Buffer.from('\r'));
+console.log(Buffer.from('\n'));
+console.log(Buffer.from('\x1a'));
+console.log(Buffer.from([0x1A]));
+
+const InterByteTimeout = require('@serialport/parser-inter-byte-timeout')
+// const Delimiter = require('@serialport/parser-delimiter');
+const ParserReadline = require('@serialport/parser-readline');
+
+
+const port = new SerialPort(devicePath, { baudRate: 115200 });
+
+const parserReadline = new ParserReadline();
+parserReadline.on('data', (data) => {
+    console.log(`READLINE: ${data}`);
+});
+
+port.pipe(parserReadline);
+
+const parserInterByteTimeout = new InterByteTimeout({ interval: 1000 });
+parserInterByteTimeout.on('data', (data) => {
+    console.log('INTERBYTETIMEOUT:');
+    console.log(data);
+});
+// port.pipe(parserInterByteTimeout);
+
+
+port.on('open', () => {
+    console.log('=====');
+    port.write('ATE0\r')
+    // port.write('AT+CIMI\r');
+    // port.write('OK');
+    port.write('AT\r');
+    port.write('AT+CMGF=1\r');
+    port.write('AT+CMGS="+6282210008543"\r');
+    port.write(`Coba dari parser-test ${moment().format('HHmmss')}`);
+    port.write(Buffer.from('\x1a'));
+
+});