Honeywell PIT Manual de usuario

PIT

Intercom Keyboard Remote Extender

User Manual

900.0405 - June 2005 - Rev. 1

ISSUE DATE REVISIONS

1 June 2005 Initial Release

Rev. 1 ii 900.0405

23-June-05

TABLE OF CONTENTS

1.1 INTRODUCTION.................................................................................................................................. 1

2.1 CONNECTIONS .................................................................................................................................. 3

2.1.1 Intercom CPU PIT ............................................................................................................ 3

2.1.2 Keyboard PIT ................................................................................................................... 4

3.1 DIP SWITCH SETTINGS...................................................................................................................... 5

3.2 BAUD RATE DIP SWITCH ................................................................................................................... 5

3.3 KEYBOARD INTERCOM ADDRESS SETTING.................................................................................... 6

Rev. 1 iii 900.0405

23-June-05

Notes:

Rev. 1 iv 900.0405

23-June-05

1.1 INTRODUCTION

This document describes the use of two RS422_RS32 Protocol Interface Translators

(PIT) in order to extend the connection of intercom control keyboards. The

interconnection between the PITs uses a standard RS232 communications channel.

Data activity on the RS232 channel is kept to a minimum.

The PIT, which connects to the VideoBloX intercom CPU, simulates a keyboard. This PIT

will be referred to as the Intercom CPU PIT. It receives LED control message packets on

its RS422 slave port and converts these into single ASCII characters in the range ‘A’..‘X’.

These characters are then transmitted out of the RS232 master port. ASCII characters in

the range ‘0’..‘7’ received on the RS232 port simulate key presses on the intercom

keyboard and are stored in a buffer. When the Intercom CPU reads the PIT, the

corresponding key code is returned.

The PIT which connects to the remote keyboard polls the Intercom keyboard via it’s

RS422 Slave port. This PIT will be referred to as the keyboard PIT. When it detects any

key press, these are converted into ASCII characters in the range ‘0’..‘7’ which are

transmitted out of the RS232 master port. ASCII characters in the range ‘A’..‘X’ received

on the RS232 port are converted into LED control packets and sent to the keyboard.

Rev. 1 1 900.0405

23-June-05

Notes:

Rev. 1 2 900.0405

23-June-05

2.1 CONNECTIONS

2.1.1 Intercom CPU PIT

The RS422 slave port of this PIT connects pin to pin to the Intercom CPU BossWare

master port. Due to the master / slave connection, pin to pin connections are required.

Pin Number Pin Function

1 RS422 Receive data [-] (from BossWare master RS422 Tx[-])

2 RS422 Receive data [+] (from BossWare master RS422 Tx[+])

3 RS422 Transmit data [+] (to BossWare master RS422 Rx[+])

4 RS422 Transmit data [-] (to BossWare master RS422 Rx[-])

5 RS422 Communications common

6 Power Supply +

7 N/C

8 N/C

9 Power Supply Common

The RS232 master port connects to the keyboard PIT RS232 master port. As both ports

have “master” pin-outs, it is necessary to swap the TXD and RXD lines.

Pin Number Pin Function

1 Internally connected to pins 4 and 6

2 TXD (data to slave device RXD)

3 RXD (data from slave device TXD)

4 Internally connected to pins 1 and 6

5 GND

6 Internally connected to pins 4 and 6

7 CTS (from slave device RTS)

8 RTS (to slave device CTS)

9 N/C

It is only necessary to connect pins 2,3 and 5 as follows:

Intercom CPU PIT Pin

Number

Keyboard PIT Pin Number Intercom CPU PIT Pin

Function

Keyboard PIT Pin Function

2 3

TXD RXD

3 2 RXD TXD

5 5 GND GND

Rev. 1 3 900.0405

23-June-05

2.1.2 Keyboard PIT

The RS422 slave port of this PIT connects to the Intercom keyboard. This slave port pin-

out is as described in 2.1. It is necessary to connect the TXD lines to the keyboard RXD

and vice versa.

Number

Keyboard PIT RS422 slave port Pin

Function

Keyboard Pin function to connect to:

1 RS422 Receive data [-] RS422 Transmit data [-]

2 RS422 Receive data [+] RS422 Transmit data [+]

3 RS422 Transmit data [+] RS422 Receive data [+]

4 RS422 Transmit data [-] RS422 Receive data [-]

5 RS422 Communications common RS422 Communications common

6 Power Supply + Power Supply +

7 N/C N/C

8 N/C N/C

9 Power Supply Common Power Supply Common

Note that is is necessary to connect a power supply at the remote / keyboard location,

as this PIT does not receive it’s power from the Intercom CPU.

The RS232 master port connection is described in 2.1.

Rev. 1 4 900.0405

23-June-05

3.1 DIP SWITCH SETTINGS

To access the configuration switches, the two screws on the top cover of the PIT must

be removed. The legend on the cover shows the switches as S1, S2 and S3. Each of

these switch groups has 8 individual switches, marked as 1 through 8. Individual

switches are referred to by the switch group, followed by the switch number. e.g. S 1/8.

Address S2/8 S2/7 S2/6 S2/5 S2/4 S2/3 S2/2 S2/1

Switch

Legend

Address

Address 5 Address 4 Address 3 Address 2 Address 1 Address 0

0 (K/B PIT) Off Off Off Off Off Off Off Off

1 Off Off Off Off Off Off Off On

2 Off Off Off Off Off Off On Off

3 Off Off Off Off Off Off On On

4 Off Off Off Off Off On Off Off

3.2 BAUD RATE DIP SWITCH

Switch 3, positions 7 and 8 are used to set the RS422 port baud rate as per the

following table:

RS422 Baud Rate S3/8 S3/7

1200 baud Off Off

9600 Baud Off On

19.2 Kbaud (default) On Off

57.6 Kbaud On On

The baud rate for the Intercom CPU PIT must match the setting for the BossWare master

communications channel.

The baud rate for the Keyboard PIT must match the baud rate setting on the Intercom

Keyboard.

Switch 3, positions 3 and 4 are used to set the RS232 port baud rate as per the

following table.

RS232 Baud Rate S3/4 S3/3

2400 baud Off Off

9600 Baud Off On

19.2 Kbaud (default) On Off

57.6 Kbaud On On

Ensure that both PITs are set to operate at the same baud rate.

Rev. 1 5 900.0405

23-June-05

3.3 Keyboard Intercom Address Setting

Note that each remote keyboard intercom must be set to address 1. The address which

the system applies to this keyboard is configured on the Intercom CPU PIT.

Rev. 1 6 900.0405

23-June-05

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