Line Format and Line Mode Controls

Introduction

The following tables summarize the details of the I/O Control blocks of each I/O line:

□ The first column indicates the LineSelector value
□ The second column indicates the bit position in the integer value reported by LineStatusAll
□ The third column indicates the value reported by LineFormat
□ The fourth column indicates the values that can be assigned to LineMode

Standard I/O sets

Standard I/O set #1

LineSelector Bit# LineFormat LineMode
DIN11 0 DIFF Input
DIN12 1 DIFF Input
IIN11 4 ISO Input
IIN12 5 ISO Input
IIN13 6 ISO Input
IIN14 7 ISO Input
IOUT11 12 ISO Output
IOUT12 13 ISO Output
TTLIO11 16 TTL

Input, Output, DriveLow or DriveHigh
TTLIO12 17 TTL

Input, Output, DriveLow or DriveHigh

Standard I/O set #2

LineSelector Bit# LineFormat LineMode
DIN21 1 DIFF Input
DIN22 3 DIFF Input
IIN21 8 ISO Input
IIN22 9 ISO Input
IIN23 1 ISO Input
IIN24 11 ISO Input
IOUT21 14 ISO Output
IOUT22 15 ISO Output
TTLIO21 18 TTL

Input, Output, DriveLow or DriveHigh
TTLIO22 19 TTL

Input, Output, DriveLow or DriveHigh

TTLIO ports mode control

The LineMode feature controls the direction and the line driver mode of each individual TTLIO port. Four modes can be selected at any time:

□ Input: input only, totem-pole driver disabled (defaut power-up settings),
□ Output: totem-pole driver capable of driving low an high,
□ DriveLow: open-collector driver capable of driving low only,
□ Drivehigh: open-emitter driver capable of driving high only.

The two latest configurations allow wired-AND configurations. The line state can be read back through the input port.

I/O modules

3610/3612 I/O Extension modules

LineSelector Bit# LineFormat LineMode
MIO1 20 TTL or DIFF Input or Output
MIO2 21 TTL Input or Output
: : : :
MIO19 38 TTL or DIFF Input or Output
MIO20 39 TTL Input or Output

3617 I/O Extension module

LineSelector Bit# LineFormat LineMode
MIO1 20 TTL Input or Output
MIO3 22 TTL Input or Output
: : : :
MIO40 59 TTL Input or Output

Even-numbered MIO lines from MIO2 up to MIO32 are not available!

MIO format and mode controls

The LineFormat feature controls the electrical style of the MIO ports. Possible values:

□ TTL: single-ended (TTL or CMOS)
□ DIFF: differential (RS422)

The LineMode feature controls the direction of the MIO ports. Possible values::

□ Input: input only,
□ Output: totem-pole driver capable of driving low an high.

The controls can only be changed during the module configuration .

See also: 3610 HD26F I/O Extension Module - TTL-RS422 and 3612 HD26F I/O Extension Module - TTL-CMOS5V-RS422 for an extensive description of the configuration.