Owner`s manual

M SERIES DAC

CABLING

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7 GND ---- Signal Ground

8 HSI HSI Input Handshake In. Used to enable or disable the

transmitting of characters

14.3.1 V87 SERIAL INTERFACE SELECTION

The desired serial interface is selected by positioning jumpers on the main board of

the module for each individual port. Please refer to Section 14.2.3 (V75 EIA-422

Cabling) for cabling information if using EIA-422 serial interface (default). If you

wish to change one or more of the ports to operate using a different serial interface,

please use the following procedure:

a. IMPORTANT: If the V87 module is installed in the base unit chassis,

remove power from the unit by positioning the On/Off switch to "0" (off)

and unplugging the power cord from the AC outlet. Remove the module by

unscrewing the two straight slot screws securing it to the back panel and

pulling the module out.

b. Refer to Figure 39 on the following page and locate the four six-position

jumper locations for serial interface selection. The jumper locations are

marked on the assembly drawing for serial interface selection as JP5 for Port

1, JP8 for Port 2, JP11 for Port 3, and JP14 for Port 4.

c. Each port is configurable for EIA-422 or EIA-485 serial interface by

installing a four-position jumper to either the 422 or 485 position as marked

on the board. The center row of pins for each port are occupied by two of

the jumper positions and the row of pins for either 422 or 485 are occupied

by the other two positions of this jumper.

NOTE: A termination resistor is installed by default. You can remove the

termination resistor for each individual port by moving JP4, JP7, JP1, or

JP13 away from the R/T position for Ports 1, 2, 3, or 4 respectively.

d. Install the V87 module into the base unit chassis (see Section 4.5).

14.3.2 V87 EIA-485 CABLING

Insert the v87 mechanical drawing