Compaq 1592DMT Compaq Armada 1500 Family of Personal Computers Maintenance and - Page 201

Addendum to Compaq Armada 1500 Maintenance and Service Guide Appendix C Modem Commands This section includes modem commands for the 56Kbps internal modem. The telephony modem is designed to operate with the preinstalled software in the computer. The modem is compatible with Microsoft Windows 95 (and later) or Windows NT 4.0. Command A Bn Cn Table C-1 Modem Commands Description Answer Command. A instructs the modem to go off-hook and answer an incoming call. Communication Standard Setting. Bn determines CCIT vs. Bell standard. 0: Selects CCITT V .22 mode when the modem is at 1200bits/s 1: Selects Bell 212A when the modem is at 1200bits/s (default). 2: Unselects V23 reverse channel (same as B3). 3: Unselects V23 reverse channel (same as B2). 15: Selects V.21 when the modem is at 300 bits/s 16: Selects Bell 103J when the modem isat 300 bits/s (default). Result Codes: OK n=0, 1, 15, 16 ERROR Otherwise Carrier Control. The modem will accept the C1 command without error in order to assure backward compatibility with communications software that issues the C1 command. However, this modem does not support the C0 command. The C0 command may instruct some earlier modems (such as the Smartmodem 1200) to not send carrier (ie., it puts them in a receive-only mode). 0: Transmit carrier always off. 1: Normal transmit carrier switching. Result Codes: OK n=1 ERROR Otherwise Continued 18 Addendum 255318-001 to Guide 284820-001