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KnowledgeBase

296 Posts

Posted - 01 Mar 2002 :  16:34:37  Show Profile  Email Poster
Graphics Client Plus User's Manual ( PDF, Revision B, March 2001)

Changes, updates and errata will appear as replies to this topic as they become available.

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akidder

1519 Posts

Posted - 13 Mar 2002 :  18:09:07  Show Profile  Email Poster
The 3V battery input is not recommended for new designs.

Please refer to this updated information for details.

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Drew Kidder
ADS Technology Transfer
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akidder

1519 Posts

Posted - 13 Mar 2002 :  18:17:15  Show Profile  Email Poster
#serial1_shunts

Erratum: Serial 1 shunts not shown in correct order

The table of shunts in section 3.6.7 lists the Serial 1 shunts in the wrong order. The top row should be listed as JP11, JP8, JP10, JP9.

Shunts JP15 and JP14 are pictured correctly, and the labels silkscreened on the Graphics Client Plus are correct.

-----------------------
Drew Kidder
ADS Technology Transfer
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akidder

1519 Posts

Posted - 23 Jan 2003 :  11:53:28  Show Profile  Email Poster
Specification Change: PCMCIA 12V Disconnected

Due to issues with some wireless cards (e.g. with Cisco Aironet), we no longer connect the 12V input power from J5 pin 4 to the PCMCIA socket(J11). This is accomplished by removing Q7, which is located on the bottom of the GC Plus under the PCMCIA header.

This change was phased into our stock effective April 2002.
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akidder

1519 Posts

Posted - 18 Feb 2003 :  11:37:23  Show Profile  Email Poster
#differential_serial

Addendum: RS-485/422/J1780 Modes: Hardware and Software Driver Settings

Configuring Serial Port 1 for use as RS485/422/J1708 requires a combination of hardware settings and software drivers to achieve the targeted mode of operation.

Hardware

Hardware shunts JP9, JP10, JP14 and JP15 redirect the StrongARM communication signals from the single-ended RS-232 transceivers to the differential transceivers used for RS485/422/J1708.  Shunts JP8 and 11 select between full and half duplex RS485/422.

Software Drivers

The software drivers must configure the Receive and Transmit Enable signals for the differential transceivers according to the mode used by the application:

Mode Duplex Receiver Transmitter
---------------------------------------------------------------------
RS422 full always on always on
RS422 half optionally off always on
during Tx
RS485 full always on Hi-Z when not transmitting
RS485 half optionally off Hi-Z when not transmitting
during Tx
J1708 (half) (always on) ( automatically on for "0"
bits and Hi-Z otherwise )


"Hi-Z" means high impedance. The transmitter is effectively not connected to the network.

The driver must configure the state of the Enable lines for the desired mode. It can also decide if, in half-duplex mode the transmitter will be enabled (if so, the application will receive back what it just transmitted)(see this topic for an example).

Note that J1708 automatically controls the Transmit and Receive Enable lines. No software control is required.
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akidder

1519 Posts

Posted - 27 Feb 2003 :  07:32:28  Show Profile  Email Poster
Addendum: J1708 Jumper Settings

J1708 is available as a factory option on revision D and later of the Graphics Client Plus.

If your system has J1708 installed, configure the jumpers on the GC Plus the same as for half-duplex RS-485 operation.
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akidder

1519 Posts

Posted - 28 May 2003 :  15:31:55  Show Profile  Email Poster
#RTC

Addendum: Real-Time Clock Feature (uses PB0 and PB1)

Revision D and later of the Graphics Client Plus features a battery-backed real-time clock (RTC) chip. This allows the GC Plus to maintain the time and date when all other power is disconnected from the board. The GC Plus uses ports PB0 and PB1 (SMTIO0 and SMTIO1) to communicate with the RTC (a Dallas DS1307) as shown in the following diagram:



PB0 and PB1 cannot be used for general purpose I/O if the system uses the real-time clock.

Revision D boards use a header (J21) for supplying backup power to the RTC. Pin 1 of J21 is the positive input (pin 1 is the square pad on the underside of the board). Revision F boards solder a long-life battery to the board; they have the option of replacing the battery with J21.

If using J21 to power the RTC, connect a 3.0V battery (2.0 to 3.5V is the valid voltage range). Because the RTC draws a very small amount of current (500nA, max.), the battery will last as long as its normal shelf life. Use fresh batteries rated for the temperature service of your product, and use Lithium ion batteries for longest life.

Use standard electronics precautions when handling GC Plus boards. Be careful not to place the GC Plus on a metallic surface, as this may short and discharge the RTC battery.
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akidder

1519 Posts

Posted - 15 Jul 2003 :  16:58:10  Show Profile  Email Poster
#GCP_F_serial_jumpers

Addendum: Location of Revision F Serial 1 Jumpers

Revision F of the GC Plus has a slightly different layout of the jumpers for Serial 1. The following diagram indicates the location of these three pin headers.

Note also the location of JP23, which is used to insert a terminating resistor on RS-485 networks.


(click to enlarge)

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