Parker PDHX-E Series User Manual page 34

Thumbwheel Interface
This section assumes that you are using Parker's TM8 thumbwheel module.
You can use up to 16 digits of the thumbwheel. The controller uses a multiplexed BCD input
scheme to read the thumbwheel data. The commands and format that allow for the
thumbwheel data entry are :
DRDxyz Read distance via thumbwheel.
VRDxyz Read velocity via thumbwheel.
LRDxyz Read loop count via thumbwheel.
TRDxyz Read time delay via thumbwheel.
VARDn,xyz Read variables via thumbwheel.
XRDxyz Read sequence count via thumbwheel.
FRDxyz Read following ratio via thumbwheel.
To request 1 digit x=y=the desired digit number.
To request all digits x=0 and y=7 (or do not set xyz fields).
To request a block of digits 0<x<y<7.
The Z field scales the thumbwheel value by 10. When reading digits from the thumbwheel,
the least significant digit will be filled first. The z field allows you to position the decimal point
were needed.
Note : Either all the fields (xy and z) or none of the fields must be used. Refer to the software
section for further explanation.
Caution - Possibility of damage to the TM8 module
THE TM8 REQUIRES A 5V SUPPLY. THE ICON COMMAND MUST BE USED TO
SELECT A PULL-UP LEVEL OF +5V OTHERWISE DAMAGE WILL OCCUR. DO NOT
CONNECT THE TM8 MODULE TO THE DRIVE UNTIL YOU ARE SURE THE SUPPLY IS
Note: The TM8 module is not EMC compliant, consequently when it is used within a
permanent installation EMC screening precautions must be taken. Generally, this will require
the TM8 module to be mounted within the equipment cabinet housing the drive.
1. Ensure that the controller is configured with NPN outputs using the OCON command.
2. Using the ICON command, set the following conditions:
Pull-up level of 5V
Function set to pull-up
VOL=0 (5V DC operation)
ENC set to 0
3. You can define any block of 5 inputs for use with the thumbwheel. Therefore you must
decide which inputs you intend to use for data (4 inputs required) and sign bit (1 input
required).
4. Configure the defined inputs for TM8 operation using the INnN command.
5. Configure the defined input for the TM8 sign bit using INnW command.
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SET TO +5V.