diff --git a/icom/icom_defs.h b/icom/icom_defs.h
new file mode 100644
index 000000000..5f83046ed
--- /dev/null
+++ b/icom/icom_defs.h
@@ -0,0 +1,159 @@
+/*
+ * hamlib - (C) Frank Singleton 2000 (vk3fcs@ix.netcom.com)
+ *
+ * icom_defs.h - Copyright (C) 2000 Stephane Fillod
+ * This include defines all kind of constants 
+ * used by the ICOM "CI-V" interface.
+ *
+ *
+ *    $Id: icom_defs.h,v 1.1 2000-09-16 01:45:00 f4cfe Exp $  
+ *
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ * 
+ */
+
+#ifndef _ICOM_DEFS_H
+#define _ICOM_DEFS_H 1
+
+/*
+ *  CI-V frame codes
+ */
+#define PR	0xfe		/* Preamble code */
+#define CTRLID	0xe0		/* Controllers's default address */
+#define FI	0xfd		/* End of message code */
+#define ACK	0xfb		/* OK code */
+#define NAK	0xfa		/* NG code */
+#define PAD	0xff		/* Transmit padding */
+
+
+/*
+ * Cn controller commands
+ * Notes:
+ * 1. When wide or normal op available: add "00" for wide, "01" normal
+ * 	  Normal or narrow op: add "00" for normal, "01" for narrow
+ * 	  Wide, normal or narrow op: add "00" for wide, "01" normal, "02" narrow
+ * 2. Memory channel number 1A=0100/1b=0101, 2A=0102/2b=0103,
+ * 	  3A=0104/3b=0105, C1=0106, C2=0107
+ */
+#define C_SND_FREQ	0x00		/* Send frequency data */
+#define C_SND_MODE	0x01		/* Send mode data, Sc */
+#define C_RD_BAND	0x02		/* Read band edge frequencies */
+#define C_RD_FREQ	0x03		/* Read display frequency */
+#define C_RD_MODE	0x04		/* Read display mode */
+#define C_SET_FREQ	0x05		/* Set frequency data(1) */
+#define C_SET_MODE	0x06		/* Set mode data, Sc */
+#define C_SET_VFO	0x07		/* Set VFO */
+#define C_SET_MEM	0x08		/* Set channel, Sc(2) */
+#define C_WR_MEM	0x09		/* Write memory */
+#define C_MEM2VFO	0x0a		/* Memory to VFO */
+#define C_CLR_MEM	0x0b		/* Memory clear */
+#define C_RD_OFFS	0x0c		/* Read duplex offset frequency */
+#define C_SET_OFFS	0x0d		/* Set duplex offset frequency */
+#define C_CTL_SCAN	0x0e		/* Control scan, Sc */
+#define C_CTL_SPLT	0x0f		/* Control split, Sc */
+#define C_SET_TS	0x10		/* Set tuning step, Sc */
+#define C_SET_ATT	0x11		/* Set attenuator, Sc */
+#define C_SET_ANT	0x12		/* Set antenna, Sc */
+#define C_CTL_ANN	0x13		/* Control announce, Sc */
+#define C_SET_AFRF	0x14		/* Set AF/RF/squelch, Sc */
+#define C_RD_SQSM	0x15		/* Read squelch condiction/S-meter level, Sc */
+#define C_SET_FUNC	0x16		/* Function settings (AGC,NB,etc.), Sc */
+#define C_SND_CW	0x17		/* Send CW message */
+#define C_RD_TRXID	0x17		/* Read transceiver ID code */
+#define C_CTL_MISC	0x7f		/* Miscellaneous control, Sc */
+
+/*
+ * Sc controller sub commands
+ */
+
+
+/*
+ * Set mode data (C_SET_MODE) sub commands
+ */
+#define S_LSB	0x00		/* Set to LSB */
+#define S_USB	0x01		/* Set to USB */
+#define S_AM	0x02		/* Set to AM */
+#define S_CW	0x03		/* Set to CW */
+#define S_RTTY	0x04		/* Set to RTTY */
+#define S_FM	0x05		/* Set to FM */
+#define S_WFM	0x06		/* Set to Wide FM */
+
+
+/*
+ * Set VFO (C_SET_VFO) sub commands
+ */
+#define S_VFOA	0x00		/* Set to VFO A */
+#define S_VFOB	0x01		/* Set to VFO B */
+#define S_BTOA	0xa0		/* VFO A=B */
+#define S_XCHNG	0xb0		/* Switch VFO A and B */
+
+/*
+ * Scan control (C_CTL_SCAN) subcommands
+ */
+#define S_STOP	0x00		/* Scan stop */
+#define S_START	0x01		/* Scan start */
+
+
+/*
+ * Split control (S_CTL_SPLT) subcommands
+ */
+#define S_SPLT_OFF	0x00		/* Split OFF */
+#define S_SPLT_ON	0x01		/* Split ON */
+#define S_DUP_OFF	0x10		/* Simplex mode */
+#define S_DUP_M 	0x11		/* Duplex - mode */
+#define S_DUP_P		0x12		/* Duplex + mode */
+
+/*
+ * Set Attenuator (C_SET_ATT) subcommands
+ */
+#define S_ATT_OFF	0x00		/* Off */
+#define S_ATT_10dB	0x10		/* 10 dB */
+#define S_ATT_20dB	0x20		/* 20 dB */
+#define S_ATT_30dB	0x30		/* 30 dB */
+
+/*
+ * Set antenna (C_SET_ANT) subcommands
+ */
+#define S_ANT1	0x00		/* Antenna 1 */
+#define S_ANT2	0x01		/* Antenna 2 */
+
+/*
+ * Announce control (C_CTL_ANN) subcommands
+ */
+#define S_ANN_ALL	0x00		/* Announce all */
+#define S_ANN_FREQ	0x01		/* Announce freq */
+
+/*
+ * Read squelch condition/S-meter level (C_RD_SQSM) subcommands
+ */
+#define S_SQL	0x01		/* Read squelch condition */
+#define S_SML	0x02		/* Read S-meter level */
+
+/*
+ * Function settings (C_SET_FUNC) subcommands
+ */
+#define S_PAMP	0x02		/* Preamp setting */
+#define S_AGC	0x12		/* AGC setting */
+#define S_NB	0x22		/* NB setting */
+#define S_TONE	0x42		/* TONE setting */
+#define S_TSQL	0x43		/* TSQL setting */
+#define S_COMP	0x44		/* COMP setting */
+#define S_VOX	0x46		/* VOX setting */
+#define S_BKIN	0x47		/* BK-IN setting */
+
+
+#endif /* _ICOM_DEFS_H */
+