Owner`s manual

121
The LONG jumper setting is used for cable distances in
excess of 1000 feet. The default jumper position is for
cable distances less than 1000 feet. If you are using
cables longer than 1000 feet, follow steps 1 and 2 on
the previous page. Next, locate the LONG jumper
location for the desired port(s) and move the four-
position jumper so that it connects the four pins closest
to the LONG marking on the board. Finally, re-install
the V76 module in the base unit chassis.
14.3 V87 CABLING INFORMATION
The V87 module has four ports that are user selectable
as EIA-422 or EIA-485 serial interface. Ports on the V87
module use the following pins and signals for
communication:
V87 PINOUT INFORMATION
PIN SERIAL INTERFACE DIRECTIO
N
DESCRIPTION
EIA-422 EIA-485
1 HSO HSO Output Handshake Out. Used to enable or disable
the receiving of characters
2 GND GND ---- Signal Ground
3 TX+ TX+/RX+ Output
Output/Inp
ut
422 - Transmit Data (+)
485 - Transmit/Receive Data (+)
4 TX- TX-/RX- Output
Output/Inp
ut
422 - Transmit Data (-)
485 - Transmit/Receive Data (-)
5 RX- NU Input/---- 232 - Receive Data (-)
485 - Not Used
6 RX+ NU Input/---- 422 - Receive Data (+)
485 - Not Used
7 GND ---- Signal Ground
8 HSI HSI Input Handshake In. Used to enable or disable
the transmitting of characters