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GTUS Magnetic Encoder rev4

GTUS Magnetic Encoder rev3Setup of GTUS magnetic encoder

The setup is very similar to the Magtek driver, in the line definition, you declare what is to be sent serially to the magnetic encoder. See below a setup for encoding forward.

Density: it is default 210 for track1 and 3 and 75 for track2. Non ISO 285.

Direction: here you can select forward or backwards standard. It is important to have the stripe length defined right. Forward and backwards non-standard is if the tracks are inverted, in this case it is important to define also the type of head (2 or 3 tracks head) correctly.

Coercivity: HICO or LOCO

Type of head: normally, the heads are 3 track heads but some are 2 tracks. Please check the head.

Current: here you can set any value between 0 and 4080. HICO is usually around 3000, LOCO 2500. Remember that the more current does not necessarily mean that the read back signal amplitude will be higher. Please refer to the corresponding recording current curve.

SSP: start sentinel position in pulses. You can fine tune the position of track1 compared to track2.

PPI: pulses per inch. If the controller shaft encoder is well set and is for example 48,425 pulses per meter, just multiply 48,425 by 0.0254 = 1,230. For 50,000 pulses per meter (metal wheel), it is 1,270.

PPI-multiplier: the electronic multiplies internally the incoming frequency, so that it can divide later and achieve better 210 and 75 dpi. This works if the belt speed stays constant. Usually 8.

Stripe length: is the length of the card in pulses. If it is a 3 3/8 card, it is 3.375 x 1,230 (or 1,270) = 4,152.

Reader: that is the position of the reader in pulses in reference to the trigger.

Early Reset: Normally no because the timeout of the read chip is enough. However, if the cards come very fast and close to each other, setting it to yes will allow to override this timeout.

What if we have to encode backwards ?

Make sure the PPI is correct (1,230 or 1,270 if metallic wheel), that the stripe length is correct, and that the head type is correct. You then fine tune start sentinel between the tracks.

Now, there are 4 options for encoding: forward standard (the upper part of the write head writes track1, most common), backwards standard (this is when you encode card from below, not used if encoding on the transport), forward non-standard (the lower part of track1 writes track1. This is when you encode from below diagonal, not used if encoding on the transport), backwards non-standard (This when you encode from above on a standard transport, the lower part of track1 writes track1). Below you see encoding on top of the table but diagonal.

Mag encoding forward standard: Track1 is on top, head 1 of mag head is encoding track1

Set type, the RJ45 that triggers the Write and the serial communication parameters