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PIT
Intercom Keyboard Remote Extender
User Manual
900.0405 - June 2005 - Rev. 1
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ISSUE DATE REVISIONS
1 June 2005 Initial Release
Rev. 1 ii 900.0405
23-June-05
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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
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Notes:
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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.
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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
6 Power Supply +
7 N/C
8 N/C
9
RS422 Communications common
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.
It is only necessary to connect pins 2,3 and 5 as follows:
Intercom CPU PIT Pin
Number
Pin Number Pin Function
1 Internally connected to pins 4 and 6
2
3
4 Internally connected to pins 1 and 6
5 GND
6
7
8 RTS (to slave device CTS)
9 N/C
Keyboard PIT Pin Number Intercom CPU PIT Pin
TXD (data to slave device RXD)
RXD (data from slave device TXD)
Internally connected to pins 4 and 6
CTS (from slave device RTS)
Function
Keyboard PIT Pin Function
2 3
3 2 RXD TXD
5 5 GND GND
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TXD RXD
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2.1.2 Keyboard PIT
The RS422 slave port of this PIT connects to the Intercom keyboard. This slave port pinout is as described in 2.1. It is necessary to connect the TXD lines to the keyboard RXD
and vice versa.
Pin
Number
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
Keyboard PIT RS422 slave port Pin
Function
Keyboard Pin function to connect to:
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.
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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
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
Address 7 Address 6 Address 5 Address 4 Address 3 Address 2 Address 1 Address 0
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.
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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.
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© 2005 Honeywell International Inc.
All rights reserved. No part of this publication may be reproduced by any means without written permission from
Honeywell Video Systems. The information in this publication is believed to be accurate in all respects. However,
Honeywell Video Systems cannot assume responsibility for any consequences resulting from the use thereof. The
information contained herein is subject to change without notice. Revisions or new editions to this publication may
be issued to incorporate such changes.
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