pg500Copyrht ©2019 by U.S.A., Inc. and all rhts are reserved. Edition Date: 0319 • Doc# PG 500 PG 500 MODIFIED CEMENTResponse send time after PG500 receives ENQ 3 ms max. Response send time after PG500 receives ACK 3 ms max. Response send time after PG500 receives NAK 3 ms max.