Switch Customer-Specific System Documentation maintenance manual, LBI-38939 for sample print-outs and complete print-out explanations.
Control Data Link
Overview
Either an RS-422 (four-wire) or an RS-232 (three-wire) full-duplex serial control data link may be employed between the console and the CIM within the CEC/IMC. Since RS-422 interfacing is superior to RS-232, PCs used within the C3 Maestro console application normally ship from the factory with an RS-422 serial port provided for this purpose. RS-232 has poorer noise performance than RS-422 and therefore, it should never be used for cable runs more than 50 feet (15.2 meters) in length. RS-422 connections may be up to 4000 feet (1219 meters) in length.
If required for a remote console installation, full-duplex 4-wire data modems can be used between the C3 Maestro and the CEC/IMC. Typically, the PC-to-modem and modem-to-CEC/IMC interconnections must be made via RS-232 interconnections since many data modems do not provide RS-422 hook-ups. These RS-232 interconnections should also not exceed 50 feet. See the following subsections for additional remote console wiring and modem configuration details.
At the C3 Maestro, RS-422/RS-232 serial control data connections terminate at the PC's serial COM port. Normally, COM1 is utilized for CEC/IMC interfacing. This serial port is normally provided by a plug-in RS-422 board inside the PC as described in the following section.
RS-422 Interfacing (Co-Located Hook-Ups)
In most cases, the PC used in the C3 Maestro console system is not equipped with a main ("mother") board RS-422 capable serial COM port. Therefore, a plug-in RS-422 capable interface board is installed in one of the PC's internal expansion slots and utilized for CEC/IMC interfacing. If the plug-in RS-422 board's serial port is configured as COM1 (normal factory configuration), the PC's main board COM1 port is disabled to prevent conflicts. Likewise, if the plug-in RS-422 board's serial port is configured as COM2, the PC's main board COM2 port is disabled. Depending upon the type of PC used, disabling of the main board's COM port is done via either a DIP switch, jumper, or a BIOS set-up program. For COM port enable/disable configuration details, refer to the section entitled "SOFTWARE INSTALLATION AND SET-UP PROCEDURE", subsection "PC CMOS SET-UP PROGRAM" later in this manual (page 26), and the PC manufacturer's documentation.
The currently approved (factory installed) plug-in RS-422 board is manufactured by B&B Electronics. Its
model number is 3PXOCC1A (part number 344A3927P38). Subsequent to the writing of this manual, additional boards may be approved.
Factory-installed plug-in RS-422 boards are configured correctly before the PC ships from the factory. This configuration includes setting DIP switches and jumpers on the plug-in board and disabling the PC's main board serial COM port per manufacturer's instructions.
Configuration for the 3PXOCC1A board is:
Address Switches (S1) | (MSB)11111111(LSB) |
| | | = 3F8 Base Hex Address |
Interrupt Jumper | IRQ4 |
Jumpers1 | JP2 − | JP5 | Upper Position |
Jumpers2 | JP6 − | JP7 | Lower Position |
If any other RS-422 plug-in serial board is used the following board configuration is recommended:
COM Port | COM1 |
Port Address | 3F8 |
Interrupt | IRQ4 |
Normally, a pre-wired 100-foot (30.5 meters) cable is supplied with the console equipment package for RS-422 control data interconnections between the CEC/IMC and a co-located C3 Maestro console. The cable's part number is 19B804083P3. It has a female DB-25 connector on one end for mating to the RS-422 male DB-25 connector at the PC. The other end is "pig-tailed" (not terminated) so the cable's 24-gauge solid wires can be punched down to the correct terminalsGat the required CEC/IMC punch block.
If using the supplied control data cable, mate its female DB-25 to the PC's RS-422 male DB-25 connector, route it to the CEC/IMC, shorten the cable as required, and punch the wires to the correct terminals. See Table 4 or the cable's assembly diagram near the end of this manual for wire color coding. Also see Figure 6A and the cable’s assemble diagram on page 36.
1Add ten (10) to jumper numbers for earlier 3PXOCC1A boards (JP2 thru JP5 = JP12 thru JP15).
2Add ten (10) to jumper numbers for earlier 3PXOCC1A boards (JP6 thru JP7 = JP16 thru JP17).
