Motorola CPCI-6020 manual Serial Interface Module Circuitry

Serial Interface Module Circuitry Transition Module Preparation and Installation

Headers J17 and J16 are used to configure serial ports 3 and 4 respectively, in tandem with the proper SIM selection. With a jumper across pins 1 and 2 on either header, the port is configured as DTE. With a jumper across pins 2 and 3, the port is configured as DCE. It is important to note that the jumper setting of the port must match the configuration of the corresponding SIM module.

Figure 7-4 Ports 3 and 4 Header Settings

1	1
3	3
J16 DTE J16 DCE
1	1
3	3
J17 DTE	J17 DCE

When installing the SIM modules, note that the headers are keyed for proper orientation. For further information on the preparation and installation of the transition module, refer to the following sections.

The next figures illustrate the CPCI-6020 baseboard and CPCI-6020-MCPTM-01 transition module with the interconnections and jumper settings for DCE/DTE configuration on each serial port.

7.4.3Serial Interface Module Circuitry

Each Serial Interface Module (SIM) has a 60-pin connector that provides all signal and power connections to the CPCI-6020-MCPTM-01 transition module.

All TTL-level signals, with the exception of data and clocks, are active low. The pull-up resistors on the CPCI-6020-MCPTM-01 transition module drive all TTL inputs to the SIM to a known logic level.

The SIMs have surge suppression circuitry for all port signals going to the external connector. This consists of a series resistor and a dual 15 V clamp diode to chassis ground. All series resistors are 100 ohms.

CPCI-6020 CompactPCI Single Board Computer Installation and Use (6806800A51C) 133